Fix #1760 check for duplicates and remove them before adding member to group

modules/member/member.controller.php

@@ -2159,9 +2159,21 @@ class memberController extends member
 	 */
 	function addMemberToGroup($member_srl, $group_srl)
 	{
+		// Return if member already belongs to group
 		$args = new stdClass();
 		$args->member_srl = $member_srl;
 		$args->group_srl = $group_srl;
+		$output = executeQueryArray('member.getMemberGroupMember', $args);
+		if ($output->data && count($output->data) == 1)
+		{
+			return;
+		}
+		if ($output->data && count($output->data) > 1)
+		{
+			executeQuery('member.deleteMemberGroupMember', $args);
+		}
+		
+		// Add member to group
 		$output = executeQuery('member.addMemberToGroup', $args);
 		
 		ModuleHandler::triggerCall('member.addMemberToGroup', 'after', $args);

modules/member/queries/getMemberGroupMember.xml

@@ -0,0 +1,12 @@
+<query id="getMemberGroupMember" action="select">
+    <tables>
+        <table name="member_group_member" />
+    </tables>
+    <columns>
+        <column name="*" />
+    </columns>
+    <conditions>
+        <condition operation="equal" column="member_srl" var="member_srl" notnull="notnull" filter="number" />
+        <condition operation="equal" column="group_srl" var="group_srl" filter="number" pipe="and" />
+    </conditions>
+</query>