Blueman tray crashes on Ubuntu Studio 20.04 session start

I have had this problem constantly in Mate on my Raspberry Pi 4. Until the bug is fixed the graphical manager is more trouble than it's worth and I can always use bluetoothctl in the terminal. So my solution was to execute 'sudo apt-get remove blueman' and delete the files in /var/crash. They shouldn't grow back, and the first reboot was quicker than ever before.

This seemed to work for me. I found it in a French Ubuntu Forum linking to a solution from Norbert-X (Kudos):

Blueman-tray crash

Basically, it is this sequence of commands in a terminal and then reboots. The error message then disappeared.

ls -ald ~/.cache
ls -al ~/.cache/blueman-* 
killall blueman-tray
rm  ~/.cache/blueman-* 
blueman-tray