diff --git a/engine/server/library/serverGame/src/shared/object/CreatureObject.cpp b/engine/server/library/serverGame/src/shared/object/CreatureObject.cpp
index 8e801159..9eaf0211 100755
--- a/engine/server/library/serverGame/src/shared/object/CreatureObject.cpp
+++ b/engine/server/library/serverGame/src/shared/object/CreatureObject.cpp
@@ -13392,11 +13392,18 @@ void CreatureObject::setGroupMissionCriticalObjects(GroupMissionCriticalObjectSe
 	DEBUG_FATAL(!isAuthoritative(), ("CreatureObject::setGroupMissionCriticalObjects: called on non-authoritative object %s", getDebugInformation(true).c_str()));
 	if (isAuthoritative())
 	{
-	    m_groupMissionCriticalObjectSet.clear();
 		//-- Anything that is not in our set, we need to add
 		{
 			for (GroupMissionCriticalObjectSet::const_iterator iter = groupMissionCriticalObjectSet.begin(); iter != groupMissionCriticalObjectSet.end(); ++iter)
-				m_groupMissionCriticalObjectSet.insert(*iter);
+				if (!m_groupMissionCriticalObjectSet.contains(*iter))
+					m_groupMissionCriticalObjectSet.insert(*iter);
+		}
+
+		//-- Anything that is not in the original set, we need to remove
+		{
+			for (GroupMissionCriticalObjectSet::const_iterator iter(m_groupMissionCriticalObjectSet.begin()); iter != m_groupMissionCriticalObjectSet.end(); ++iter)
+				if (groupMissionCriticalObjectSet.find(*iter) == groupMissionCriticalObjectSet.end())
+					m_groupMissionCriticalObjectSet.erase(*iter);
 		}
 	}
 }