Hi,

I upgraded and moved a  moodle installation from 3.6 to 3.11 and then to 4.3. Everything seems to be working just fine except the glossary activity.

When I add a glossary activity and save it, I can no longer access its settings and get the following message:

 
Exception - role_get_name(): Argument #1 ($role) must be of type stdClass, null given, called in [dirroot]/lib/accesslib.php on line 4699

More information about this error
Debug info:
Error code: generalexceptionmessage
{{Stack trace: }}

• line 4533 of /lib/accesslib.php: TypeError thrown
• line 4699 of /lib/accesslib.php: call to role_get_name()
• line 4935 of /lib/accesslib.php: call to role_fix_names()
• line 710 of /course/moodleform_mod.php: call to get_role_names_with_caps_in_context()
• line 528 of /course/moodleform_mod.php: call to moodleform_mod->add_rating_settings()
• line 140 of /mod/glossary/mod_form.php: call to moodleform_mod->standard_coursemodule_elements()
• line 217 of /lib/formslib.php: call to mod_glossary_mod_form->definition()
• line 127 of /course/moodleform_mod.php: call to moodleform->__construct()
• line 161 of /course/modedit.php: call to moodleform_mod->__construct()

Output buffer: <br /> <b>Warning</b>: Undefined array key 9 in <b>/var/www/html/moodle/lib/accesslib.php</b> on line <b>4932</b><br /> <br /> <b>Warning</b>: Undefined array key 12 in <b>/var/www/html/moodle/lib/accesslib.php</b> on line <b>4932</b><br />