SL-10006 Fixed crash in addScriptLine

indra/newview/llfloaterscriptdebug.cpp

@@ -137,9 +137,12 @@ void LLFloaterScriptDebug::addScriptLine(const std::string &utf8mesg, const std:
 	if (objectp)
 	{
 		if(objectp->isHUDAttachment())
+		{
+			if (isAgentAvatarValid())
 			{
 				((LLViewerObject*)gAgentAvatarp)->setIcon(LLViewerTextureManager::getFetchedTextureFromFile("script_error.j2c", FTT_LOCAL_FILE, TRUE, LLGLTexture::BOOST_UI));
 			}
+		}
 		else
 		{
 			objectp->setIcon(LLViewerTextureManager::getFetchedTextureFromFile("script_error.j2c", FTT_LOCAL_FILE, TRUE, LLGLTexture::BOOST_UI));