Unfortunately, there is not much we can do here - Your system ran out of EFI variable storage place.
Your best bet is to find large EFI variables in /sys/firmware/efi/efivars that are safe to delete and delete them. A factory reset of the BIOS may also clear up the variable storage, but not sure. I think deleting necessary variables will trigger a factory reset too, as it needs to repopulate them, but I would not try it myself. Also, deleting the variables might just mark them for deletion but not actually trigger garbage collection.
Thank you for your bug report,
Unfortunately, there is not much we can do here - Your system ran out of EFI variable storage place.
Your best bet is to find large EFI variables in /sys/firmware/ efi/efivars that are safe to delete and delete them. A factory reset of the BIOS may also clear up the variable storage, but not sure. I think deleting necessary variables will trigger a factory reset too, as it needs to repopulate them, but I would not try it myself. Also, deleting the variables might just mark them for deletion but not actually trigger garbage collection.
Good luck!