CHUI-120 WIP Fix for crash after closing the chat floater.

indra/newview/llimconversation.cpp

@@ -114,6 +114,10 @@ BOOL LLIMConversation::postBuild()
 
 BOOL LLIMConversation::tick()
 {
+	// This check is needed until LLFloaterReg::removeInstance() is synchronized with deleting the floater
+	// via LLMortician::updateClass(), to avoid calling dead instances. See LLFloater::destroy().
+	if (isDead()) return false;
+
 	// Need to resort the participant list if it's in sort by recent speaker order.
 	if (mParticipantList)
 	{

indra/newview/llimfloater.cpp

@@ -487,6 +487,10 @@ void LLIMFloater::onAvatarNameCache(const LLUUID& agent_id,
 // virtual
 BOOL LLIMFloater::tick()
 {
+	// This check is needed until LLFloaterReg::removeInstance() is synchronized with deleting the floater
+	// via LLMortician::updateClass(), to avoid calling dead instances. See LLFloater::destroy().
+	if (isDead()) return false;
+
 	BOOL parents_retcode = LLIMConversation::tick();
 
 	if ( mMeTyping )

indra/newview/llnearbychat.cpp

@@ -404,6 +404,10 @@ void LLNearbyChat::showTranslationCheckbox(BOOL show)
 
 BOOL LLNearbyChat::tick()
 {
+	// This check is needed until LLFloaterReg::removeInstance() is synchronized with deleting the floater
+	// via LLMortician::updateClass(), to avoid calling dead instances. See LLFloater::destroy().
+	if (isDead()) return false;
+
 	BOOL parents_retcode = LLIMConversation::tick();
 
 	displaySpeakingIndicator();