Crashes after Escape then Undo

[gitgithubb]

Crashes after Undo.

apply operation w ctrl left click. press excape (1 time only), then press ctl z. crashes blender.

apply operation w ctrl left click. press excape (2 time only), then press ctl z. does not crash blender.

cheers. thanks.

[gitgithubb]

thank you very much for your most excellent work. very greatful. cheers to you and yours jayanam.