SUMMARY
Plasma crashes sometimes when I try to set a new widget, like the Memory Usage widget.

STEPS TO REPRODUCE
1. Make a Memory Usage widget on a panel
2. If it was my computer, it has already crashed and when I try again it works.
real 2. right click the sensor and click Configure system monitor sensor... now configure it and change it a bit, like the type of sensor from pie to horizontal or something
3. Crash! My top panel (my only panel) disappears and Firefox acts normal until like 5-10 seconds later when it appears back, normal. Dr Konqi appears and says something crashed unexpectedly.

OBSERVED RESULT
Crashes and panels disappear for 5-10 seconds.

EXPECTED RESULT
Well I expect it to not crash (not sure if its my pc but plasma shouldn't be this buggy). I like KDE and I think it's very cool and I don't actually think its this buggy but yeah i'm not sure

SOFTWARE/OS VERSIONS
Windows: we don't do that here
macOS: nor do we do macos
Linux/KDE Plasma: Linux Kubuntu 5.11.0-37-generic
(available in About System)
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION