Crash during Undo when using PowerPencil

Steps to reproduce:

• I drew a bit with the PowerPencil
• did undo at some point

What happened?

Inkscape crashed. This is not reliably reproducible, but the backtrace may still be useful.

What should have happened?

No crash.

Inkscape Version and Operating System:

• Inkscape Version: 1.0alpha (a241d975, 2019-03-02)
• Operating System: Linux Mint 19

inkscape_debug_trace_2019.03.02.19.27.42.txt

Full backtrace with symbols: inkscape-backtrace-undo-powerpencil.txt