diff --git a/modules/document/tpl/extra_keys.html b/modules/document/tpl/extra_keys.html
index 407d99a41..8bdb07b6d 100644
--- a/modules/document/tpl/extra_keys.html
+++ b/modules/document/tpl/extra_keys.html
@@ -61,7 +61,7 @@
 			<div class="x_control-group" data-invisible-types="file">
 				<label class="x_control-label" for="default">{$lang->default_value}</label>
 				<div class="x_controls">
-					<input type="text" name="default" id="default" value="{$selected_var->getDefaultValue()}" />
+					<input type="text" name="default" id="default" value="{$selected_var ? $selected_var->getDefaultValue() : ''}" />
 					<p class="x_help-block">{$lang->about_extra_vars_default_value}</p>
 				</div>
 			</div>