Activate filesystem quota

I tried to activate filesystem quota on /home partition through UMC but I got this error. Is it a bug?

UCS Version: 5.0-1 errata242

Internal server error during “quota/partitions/activate”.
TypeError: unsupported operand type(s) for ^: ‘bool’ and ‘NoneType’
if not (activate ^ quota_enabled):
File “/usr/lib/python3/dist-packages/univention/management/console/modules/quota/”, line 209, in _do_activate_quota_partition
status = _do_activate_quota_partition(fs, fstab_entry, activate)
File “/usr/lib/python3/dist-packages/univention/management/console/modules/quota/”, line 185, in _do_activate_quota
return self._function(*tmp, **self._kwargs)
File “/usr/lib/python3/dist-packages/notifier/”, line 105, in call
result = self._function()
File “/usr/lib/python3/dist-packages/notifier/”, line 80, in _run
Traceback (most recent call last):

Request: quota/partitions/activate
Internal server error during “quota/partitions/activate”.