This seems to have been a kernel crash report, right? What did you do when apport asked you what to do about the report? (Send/Cancel)? I tried this here, works fine for me.
** Changed in: apport (Ubuntu)
Status: Unconfirmed => Needs Info
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[apport] apport-gtk crashed with AssertionError in run_crash()
https://launchpad.net/bugs/87693
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