diff --git a/modules/board/tpl/addition_setup.html b/modules/board/tpl/addition_setup.html
index 78b6214e4..954d0c56e 100644
--- a/modules/board/tpl/addition_setup.html
+++ b/modules/board/tpl/addition_setup.html
@@ -28,15 +28,15 @@
 		<div class="x_control-group">
 			<label for="include_days" class="x_control-label">{$lang->cmd_board_include_days}</label>
 			<div class="x_controls">
-				<input name="include_days" id="include_days" type="number" min="0" step="0.01" value="{$module_info->include_days ?: 0}" /> {$lang->unit_day}
+				<input name="include_days" id="include_days" type="number" min="0" step="0.01" value="{$module_info->include_days ?? 0}" /> {$lang->unit_day}
 				<p class="x_help-block">{$lang->about_board_include_days}</p>
 			</div>
 		</div>
 		<div class="x_control-group">
 			<label class="x_control-label">{$lang->cmd_board_include_notice}</label>
 			<div class="x_controls">
-				<label class="x_inline"><input name="include_notice" type="radio" value="Y" checked="checked"|cond="$module_info->include_notice !== 'N'" /> {$lang->cmd_yes} </label>
-				<label class="x_inline"><input name="include_notice" type="radio" value="N" checked="checked"|cond="$module_info->include_notice === 'N'" /> {$lang->cmd_no} </label>
+				<label class="x_inline"><input name="include_notice" type="radio" value="Y" checked="checked"|cond="!isset($module_info->include_notice) || $module_info->include_notice !== 'N'" /> {$lang->cmd_yes} </label>
+				<label class="x_inline"><input name="include_notice" type="radio" value="N" checked="checked"|cond="isset($module_info->include_notice) && $module_info->include_notice === 'N'" /> {$lang->cmd_no} </label>
 			</div>
 		</div>
 		<div class="btnArea">
diff --git a/modules/board/tpl/board_insert.html b/modules/board/tpl/board_insert.html
index f3b8ccbd9..511ede86e 100644
--- a/modules/board/tpl/board_insert.html
+++ b/modules/board/tpl/board_insert.html
@@ -9,7 +9,7 @@
 	<input type="hidden" name="act" value="procBoardAdminInsertBoard" />
 	<input type="hidden" name="page" value="{$page}" />
 	<input type="hidden" name="module_srl" value="{$module_info->module_srl}" />
-	<input cond="$mid || $module_srl" type="hidden" name="success_return_url" value="{getRequestUriByServerEnviroment()}" />
+	<input cond="!empty($mid) || !empty($module_srl)" type="hidden" name="success_return_url" value="{getRequestUriByServerEnviroment()}" />
 	<input cond="$logged_info->is_admin != 'Y'" type="hidden" name="board_name" value="{$module_info->mid}" />
 	<input type="hidden" name="xe_validator_id" value="modules/board/tpl/board_insert/1" />
 	<section class="section">
@@ -201,7 +201,7 @@
 				<p style="padding:3px 0 0 0">{$lang->about_list_config}</p>
 				<div style="display:inline-block">
 					<select class="multiorder_show" size="8" multiple="multiple" style="width:220px;vertical-align:top;margin-bottom:8px">
-						<option loop="$extra_vars => $key, $val" cond="!$list_config[$key]" value="{$key}">{Context::replaceUserLang($val->name)}</option>
+						<option loop="$extra_vars => $key, $val" cond="empty($list_config[$key])" value="{$key}">{Context::replaceUserLang($val->name)}</option>
 					</select><br />
 					<button type="button" class="x_btn multiorder_add" style="vertical-align:top">{$lang->cmd_insert}</button>
 				</div>
diff --git a/modules/editor/tpl/editor_module_config.html b/modules/editor/tpl/editor_module_config.html
index 06adc1961..9da9cc4ed 100644
--- a/modules/editor/tpl/editor_module_config.html
+++ b/modules/editor/tpl/editor_module_config.html
@@ -147,8 +147,8 @@
 						<input type="radio" name="content_font" id="font_{$name}" value="{$detail}" checked="checked"|cond="$editor_config->content_font == $detail && $editor_config->font_defined != 'Y'" /> {$fontname_simplified}
 					</label>
 					<label>
-						<input type="radio" class="fontSelector" name="font_defined" id="font_defined" value="Y" checked="checked"|cond="$editor_config->font_defined== 'Y'" /> {$lang->by_you} :
-						<input type="text" name="content_font_defined" value="{$editor_config->content_font}"|cond="$editor_config->font_defined == 'Y'" />
+						<input type="radio" class="fontSelector" name="font_defined" id="font_defined" value="Y" checked="checked"|cond="isset($editor_config->font_defined) && $editor_config->font_defined == 'Y'" /> {$lang->by_you} :
+						<input type="text" name="content_font_defined" value="{$editor_config->content_font}"|cond="isset($editor_config->font_defined) && $editor_config->font_defined == 'Y'" />
 					</label>
 				</td>
 			</tr>
diff --git a/modules/module/module.admin.model.php b/modules/module/module.admin.model.php
index 6c2c60e69..982c4502c 100644
--- a/modules/module/module.admin.model.php
+++ b/modules/module/module.admin.model.php
@@ -172,6 +172,7 @@ class ModuleAdminModel extends Module
 		$grant_list->manager->default = 'manager';
 		Context::set('grant_list', $grant_list);
 		// Get a permission group granted to the current module
+		$selected_group = array();
 		$default_grant = array();
 		$args = new stdClass();
 		$args->module_srl = $module_srl;
@@ -375,21 +376,24 @@ class ModuleAdminModel extends Module
 			$skin_vars = $oModuleModel->getModuleMobileSkinVars($module_srl);
 		}
 
-		if($skin_info->extra_vars)
+		if($skin_info && $skin_info->extra_vars)
 		{
 			foreach($skin_info->extra_vars as $key => $val)
 			{
 				$group = $val->group;
 				$name = $val->name;
 				$type = $val->type;
-				if($skin_vars[$name])
+				if (isset($skin_vars[$name]) && $skin_vars[$name])
 				{
 					$value = $skin_vars[$name]->value;
 				}
-				else $value = '';
-				if($type=="checkbox")
+				else
 				{
-					$value = $value?unserialize($value):array();
+					$value = '';
+				}
+				if ($type === 'checkbox')
+				{
+					$value = $value ? unserialize($value) : [];
 				}
 
 				$value = empty($value) ? $val->default : $value;
diff --git a/modules/module/module.model.php b/modules/module/module.model.php
index a1668b007..f15de98ca 100644
--- a/modules/module/module.model.php
+++ b/modules/module/module.model.php
@@ -424,14 +424,14 @@ class ModuleModel extends Module
 	 *
 	 * @param stdClass $moduleInfo Module information
 	 */
-	private static function _applyDefaultSkin(&$module_info)
+	private static function _applyDefaultSkin($module_info)
 	{
-		if($module_info->is_skin_fix == 'N')
+		if(isset($module_info->is_skin_fix) && $module_info->is_skin_fix == 'N')
 		{
 			$module_info->skin = '/USE_DEFAULT/';
 		}
 
-		if($module_info->is_mskin_fix == 'N' && $module_info->mskin !== '/USE_RESPONSIVE/')
+		if(isset($module_info->is_mskin_fix) && $module_info->is_mskin_fix == 'N' && $module_info->mskin !== '/USE_RESPONSIVE/')
 		{
 			$module_info->mskin = '/USE_DEFAULT/';
 		}
diff --git a/modules/module/tpl/module_grants.html b/modules/module/tpl/module_grants.html
index 9c6aab3ac..dc4557465 100644
--- a/modules/module/tpl/module_grants.html
+++ b/modules/module/tpl/module_grants.html
@@ -58,16 +58,16 @@
 				<label for="{$grant_name}_default" class="x_control-label">{$grant_item->title}</label>
 				<div class="x_controls">
 					<select name="{$grant_name}_default" id="{$grant_name}_default" class="grant_default">
-						<option value="0" <!--@if($default_grant[$grant_name]=='all')-->selected="selected"<!--@end-->>{$lang->grant_to_all}</option>
-						<option value="-1" <!--@if($default_grant[$grant_name]=='member' || $default_grant[$grant_name]=='site')-->selected="selected"<!--@end-->>{$lang->grant_to_login_user}</option>
-						<option value="-4" <!--@if($default_grant[$grant_name]=='not_member')-->selected="selected"<!--@end-->>{$lang->grant_to_non_login_user}</option>
-						<option value="-3" <!--@if($default_grant[$grant_name]=='manager')-->selected="selected"<!--@end-->>{$lang->grant_to_admin}</option>
-						<option value="" <!--@if($default_grant[$grant_name]=='group')-->selected="selected"<!--@end-->>{$lang->grant_to_group}</option>
+						<option value="0" <!--@if(($default_grant[$grant_name] ?? '') == 'all')-->selected="selected"<!--@end-->>{$lang->grant_to_all}</option>
+						<option value="-1" <!--@if(($default_grant[$grant_name] ?? '') == 'member' || ($default_grant[$grant_name] ?? '') == 'site')-->selected="selected"<!--@end-->>{$lang->grant_to_login_user}</option>
+						<option value="-4" <!--@if(($default_grant[$grant_name] ?? '') == 'not_member')-->selected="selected"<!--@end-->>{$lang->grant_to_non_login_user}</option>
+						<option value="-3" <!--@if(($default_grant[$grant_name] ?? '') == 'manager')-->selected="selected"<!--@end-->>{$lang->grant_to_admin}</option>
+						<option value="" <!--@if(($default_grant[$grant_name] ?? '') == 'group')-->selected="selected"<!--@end-->>{$lang->grant_to_group}</option>
 					</select>
 					<div id="zone_{$grant_name}" hidden style="margin:8px 0 0 0">
 						<!--@foreach($group_list as $group_srl => $group_item)-->
 						<label for="grant_{$grant_name}_{$group_srl}" class="x_inline">
-							<input type="checkbox" class="checkbox" name="{$grant_name}" value="{$group_item->group_srl}" id="grant_{$grant_name}_{$group_srl}" checked="checked"|cond="is_array($selected_group[$grant_name])&&in_array($group_srl,$selected_group[$grant_name])" />
+							<input type="checkbox" class="checkbox" name="{$grant_name}" value="{$group_item->group_srl}" id="grant_{$grant_name}_{$group_srl}" checked="checked"|cond="is_array($selected_group[$grant_name] ?? null) && in_array($group_srl, $selected_group[$grant_name])" />
 							{Context::replaceUserLang($group_item->title, true)}
 						</label>
 						<!--@end-->
diff --git a/modules/module/tpl/skin_config.html b/modules/module/tpl/skin_config.html
index 7ea18ce7e..895b71b44 100644
--- a/modules/module/tpl/skin_config.html
+++ b/modules/module/tpl/skin_config.html
@@ -25,7 +25,7 @@
 				{$lang->skin_author}
 			</label>
 			<div class="x_controls" style="padding-top:3px">
-				<block loop="$skin_info->author=>$author">
+				<block loop="$skin_info->author ?? [] => $author">
 					{$author->name}
 					<block cond="$author->homepage || $author->email_address">
 						(<a href="{$author->homepage}" target="_blank" cond="$author->homepage">{$author->homepage}</a>
@@ -41,16 +41,16 @@
 		</div>
 		<div class="x_control-group">
 			<label class="x_control-label">{$lang->date}</label>
-			<div class="x_controls" style="padding-top:3px">{zdate($skin_info->date, 'Y-m-d')}</div>
+			<div class="x_controls" style="padding-top:3px">{zdate($skin_info->date ?? '', 'Y-m-d')}</div>
 		</div>
-		<div class="x_control-group" cond="$skin_info->license || $skin_info->license_link">
+		<div class="x_control-group" cond="!empty($skin_info->license) || !empty($skin_info->license_link)">
 			<label class="x_control-label">{$lang->skin_license}</label>
 			<div class="x_controls" style="padding-top:3px">
 				{nl2br(trim($skin_info->license))}
 				<p cond="$skin_info->license_link"><a href="{$skin_info->license_link}" target="_blank">{$skin_info->license_link}</a></p>
 			</div>
 		</div>
-		<div class="x_control-group" cond="$skin_info->description">
+		<div class="x_control-group" cond="!empty($skin_info->description)">
 			<label class="x_control-label">{$lang->description}</label>
 			<div class="x_controls" style="padding-top:3px">{nl2br(trim($skin_info->description))}</div>
 		</div>
@@ -79,7 +79,7 @@
 			</div>
 		</div>
 		<block loop="$skin_info->extra_vars => $key, $val">
-			<block cond="$val->group && ((!$group) || $group != $val->group)">
+			<block cond="$val->group && (empty($group) || $group != $val->group)">
 				{@$group = $val->group}
 				</section>
 				<section class="section">
@@ -90,10 +90,10 @@
 				<label class="x_control-label" for="{$val->name}"|cond="$val->type!='text'&&$val->type!='textarea'" for="lang_{$val->name}"|cond="$val->type=='text'||$val->type=='textarea'">{$val->title}</label>
 				<div class="x_controls">
 					<!--// text -->
-					<input cond="$val->type == 'text'" type="text" name="{$val->name}" id="{$val->name}" value="<!--@if(strpos($val->value, '$user_lang->') === false)-->{$val->value}<!--@else-->{htmlspecialchars($val->value, ENT_COMPAT | ENT_HTML401, 'UTF-8', false)}<!--@end-->" class="lang_code" />
+					<input cond="$val->type == 'text'" type="text" name="{$val->name}" id="{$val->name}" value="<!--@if(strpos($val->value ?? '', '$user_lang->') === false)-->{$val->value}<!--@else-->{htmlspecialchars($val->value, ENT_COMPAT | ENT_HTML401, 'UTF-8', false)}<!--@end-->" class="lang_code" />
 
 					<!--// textarea -->
-					<textarea cond="$val->type == 'textarea'" rows="8" cols="42" name="{$val->name}" id="{$val->name}" class="lang_code"><!--@if(strpos($val->value, '$user_lang->') === false)-->{$val->value}<!--@else-->{htmlspecialchars($val->value, ENT_COMPAT | ENT_HTML401, 'UTF-8', false)}<!--@end--></textarea>
+					<textarea cond="$val->type == 'textarea'" rows="8" cols="42" name="{$val->name}" id="{$val->name}" class="lang_code"><!--@if(strpos($val->value ?? '', '$user_lang->') === false)-->{$val->value}<!--@else-->{htmlspecialchars($val->value, ENT_COMPAT | ENT_HTML401, 'UTF-8', false)}<!--@end--></textarea>
 
 					<!--// select -->
 					<select cond="$val->type == 'select'" name="{$val->name}" id="{$val->name}">
@@ -130,6 +130,6 @@
 		<button class="x_btn x_btn-primary x_pull-right" type="submit">{$lang->cmd_registration}</button>
 	</div>
 </form>
-<!--@if($use_colorpicker)-->
+<!--@if($use_colorpicker ?? false)-->
 	<!--%load_js_plugin("spectrum")-->
 <!--@end-->
diff --git a/modules/rss/tpl/rss_module_config.html b/modules/rss/tpl/rss_module_config.html
index 48a9a0163..f23fa5c11 100644
--- a/modules/rss/tpl/rss_module_config.html
+++ b/modules/rss/tpl/rss_module_config.html
@@ -1,13 +1,13 @@
 <section class="section">
 	<h1>{$lang->open_rss}</h1>
 	<p>{$lang->about_open_rss}</p>
-	
+
 	<form ruleset="insertRssModuleConfig" action="./" method="post" class="x_form-horizontal">
 		<input type="hidden" name="module" value="rss" />
 		<input type="hidden" name="act" value="procRssAdminInsertModuleConfig" />
 		<input type="hidden" name="success_return_url" value="{getRequestUriByServerEnviroment()}" />
 		<input type="hidden" name="target_module_srl" value="{$module_config->module_srl ?: $module_srls}" />
-		
+
 		<div class="x_control-group">
 			<label for="open_rss" class="x_control-label">{$lang->open_rss}</label>
 			<div class="x_controls">
@@ -28,14 +28,14 @@
 		<div class="x_control-group">
 			<label for="feed_description" class="x_control-label">{$lang->description}</label>
 			<div class="x_controls">
-				<textarea name="feed_description" id="feed_description" rows="4" cols="42" style="float:left;margin-right:8px">{escape($module_config->feed_description)}</textarea>
+				<textarea name="feed_description" id="feed_description" rows="4" cols="42" style="float:left;margin-right:8px">{escape($module_config->feed_description ?? '')}</textarea>
 				<p class="x_help-block">{$lang->about_feed_description}</p>
 			</div>
 		</div>
 		<div class="x_control-group">
 			<label for="feed_copyright" class="x_control-label">{$lang->feed_copyright}</label>
 			<div class="x_controls">
-				<textarea name="feed_copyright" id="feed_copyright" rows="4" cols="42" style="float:left;margin-right:8px">{escape($module_config->feed_copyright)}</textarea>
+				<textarea name="feed_copyright" id="feed_copyright" rows="4" cols="42" style="float:left;margin-right:8px">{escape($module_config->feed_copyright ?? '')}</textarea>
 				<p class="x_help-block">{$lang->about_feed_copyright}</p>
 			</div>
 		</div>