Inkscape crashes when undoing a merge of two graphical objects.

Steps to reproduce:

• open Inkscape
• draw a rectangle
• draw a circle
• move the circle over the rectangle
• click PATH -> UNION (or similar operation)
• see the result of the merge
• click EDIT > UNDO, or hit CTRL-Z

What happened?

Inkscape crashes.

What should have happened?

The operation should have been undone and Inkscape should continue working normally.

Inkscape Version and Operating System:

• Inkscape Version: Inkscape 0.92.4 (unknown)
• Operating System: Linux x86_64
• Operating System version: Fedora 29