Michele Ballabio writes:

quoted text
> This commit (and many others) has two parents, but the two parents
> have the same hash. So gitk tries to unset the same variable twice,
> hence the error. At this point, the fix for gitk should be either to
> check if the parents have the same hash when reading the commit or
> avoiding to unset two times the same variable.

Actually, there is a commit like that in the kernel tree, and with
this clue, I have managed to reproduce the problem on the kernel tree
with the command

	gitk v2.6.12-rc2..13e652800d1644dfedcd0d59ac95ef0beb7f3165

I have just pushed out a fix to my gitk.git tree.

Paul.
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