undo button pressed quickly several times caused crash

[4evermaat]

I noticed i had accidentally typed some long string into one of the comparison files. I left the program laptop for some time (16 hours). Came back and saw the long string.
And proceeded to press undo button several times to remove any typing changes made.
Then undo took place, and the WinMerge program then crashed immediately afterwards.

Not sure what happened, but figured it was worth reporting.

WinMerge.txt

[sdottaka]

So far I have not been able to reproduce this problem.
If you know the conditions to reproduce it, I would appreciate it if you could let me know.