[Bug] Removing pinned icons crashes the panel

[EbonJaeger]

Description

Removing a pinned application from Icon Tasklist crashes the panel. Probably a separate issue, but pinning an application also does not seem to work, but at least the panel doesn't crash.

Budgie version

budgie-desktop 10.9.2 (git-beaadd6a34993f0c205b5caafa8e56ef7df6af11)

Operating System

Solus 4.6

Steps to reproduce the issue

1. Right click pinned icon in Icon Tasklist
2. Click the Unfavorite button

Actual result

The panel crashes. Interestingly enough, the icon is actually no longer pinned after restarting the panel.

Expected result

No crash, icon becomes unpinned, unicorns and roses.

Additional information

When I tried to get it to happen while running GDB, the crash does not happen and everything works as expected. Minus the unicorns and roses.