diff -r d8c37b383028 indra/newview/llparticipantlist.cpp
--- a/indra/newview/llparticipantlist.cpp	Mon Jul 18 15:41:14 2011 -0400
+++ b/indra/newview/llparticipantlist.cpp	Thu Jul 21 16:57:46 2011 +0300
@@ -798,11 +798,19 @@
 
 bool LLParticipantList::LLParticipantListMenu::isGroupModerator()
 {
-	// Agent is in Group Call
+	if (!mParent.mSpeakerMgr)
+	{
+		llwarns << "Speaker manager is missing" << llendl;
+		return false;
+	}
+
+	// Is session a group call/chat?
 	if(gAgent.isInGroup(mParent.mSpeakerMgr->getSessionID()))
 	{
-		// Agent is Moderator
-		return mParent.mSpeakerMgr->findSpeaker(gAgentID)->mIsModerator;
+		LLSpeaker* speaker = mParent.mSpeakerMgr->findSpeaker(gAgentID).get();
+
+		// Is agent a moderator?
+		return speaker && speaker->mIsModerator;
 	}
 	return false;
 }