Comment 39 for bug 408530

So to sum up

- Did you speak to the contact before?
Yes. In between the window was closed.

- Did you initate the conversation or did he?
I initiated it in this case.

- Did you close the chat window containing a tab with this contact previoulsy? Or just close the tab but not the whole window?
I did not use tabs, but have every conversation in its own window

- Did you move the tab inside the chat window?
No

- Did you detach the tab to a new window?
No

If I know initiate the chat to one of the two previous conversations, it works. As soon as I open the second conversation and type and send, it crashes. Hope these three posts help. Cheers.