Created attachment 624066 [details] [diff] [review]
[Exception... "'TypeError: aSubject is null' when calling method: [nsIObserver::observe]" nsresult: "0x8057001c (NS_ERROR_XPC_JS_THREW_JS_OBJECT)" location: "JS frame :: resource:///modules/jsProtoHelper.jsm :: <TOP_LEVEL> :: line 444" data: no]
The notification is: aTopic = update-conv-title, aSubject = null
It seems to come from: https://hg.mozilla.org/comm-central/annotate/42e874815e9c/chat/protocols/irc/irc.js#l351
I think this is an existing bug of the Tb IM UI that was exposed by https://hg.mozilla.org/comm-central/rev/42e874815e9c#l1.116 that was checked-in as part of bug 753807.
Comment on attachment 624066 [details] [diff] [review]
Looks good to me.