'metaphorical-door'. You seem to go through it into another "place".
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NOTICE (E_NOTICE):
Trying to access array offset on value of type bool
At line 102 in lib/userprefs/userprefslib.php
NOTICE (E_NOTICE):
Trying to access array offset on value of type bool
At line 103 in lib/userprefs/userprefslib.php