Public bug reported:

Binary package hint: yelp

On my Ubuntu installation, it is possible, replicably,  to make the Help
system crash with the error:

 ** Yelp:ERROR:(yelp-document.c:275):yelp_document_cancel_page:
assertion failed: (document != NULL && YELP_IS_DOCUMENT (document))

The following is the sequence: 
start Help; search for keyword "bookmarks"; click on one of the links offered 
("Visual Effects", for example); first of these clicks has no effect at all; 
second click causes close down of Help system.

This is on 8.04 (upgraded from 7.10, not a new installation).

I couldn't manage to get yelp to come up under strace, so no strace log 
available.
When I ran yelp from within gdb, the symptoms changed -- again, first click has 
no effect, but now second click hangs
the system rather than having it crash.
The gdb log is attached.

** Affects: yelp (Ubuntu)
     Importance: Undecided
         Status: New

-- 
user help system  crashes under certain circumstances
https://bugs.launchpad.net/bugs/254277
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