MAINT-1150 FIX (Speculative) crash on (shutdown) in LLVOAvatar::avString()

Reviewed by vir

indra/newview/llappearancemgr.cpp

@@ -229,12 +229,13 @@ LLUpdateAppearanceOnDestroy::LLUpdateAppearanceOnDestroy(bool update_base_outfit
 
 LLUpdateAppearanceOnDestroy::~LLUpdateAppearanceOnDestroy()
 {
-	LL_INFOS("Avatar") << self_av_string() << "done update appearance on destroy" << LL_ENDL;
-
-	selfStopPhase("update_appearance_on_destroy");
-	
 	if (!LLApp::isExiting())
 	{
+		// speculative fix for MAINT-1150
+		LL_INFOS("Avatar") << self_av_string() << "done update appearance on destroy" << LL_ENDL;
+
+		selfStopPhase("update_appearance_on_destroy");
+
 		LLAppearanceMgr::instance().updateAppearanceFromCOF(mUpdateBaseOrder);
 	}
 }