To reproduce:

1. Create an assignment which accepts file submissions
2. Go to the assignment
3. View all submissions
4. Open the grader pane for one person by clicking 'Grade'
5. Go back to the view all submissions page
6. Select one or more assignments without any submission.
7. Go to the bulk actions menu.
8. Select "Remove submission" then press "Go"
9. The following error is then thrown:

   Coding error detected, it must be fixed by a programmer: moodle_database::update_record_raw() id field must be specified.

   More information about this error

   ×Debug info:

   Error code: codingerror

   ×Stack trace:

   line 1159 of /lib/dml/pgsql_native_moodle_database.php: coding_exception thrown

   line 1216 of /lib/dml/pgsql_native_moodle_database.php: call to pgsql_native_moodle_database->update_record_raw()

   line 327 of /mod/assign/submission/file/locallib.php: call to pgsql_native_moodle_database->update_record()

   line 7960 of /mod/assign/locallib.php: call to assign_submission_file->remove()

   line 8028 of /mod/assign/locallib.php: call to assign->remove_submission()

   line 4935 of /mod/assign/locallib.php: call to assign->process_remove_submission()

   line 533 of /mod/assign/locallib.php: call to assign->process_grading_batch_operation()

   line 55 of /mod/assign/view.php: call to assign->view()

   ×Output buffer: <br /> <b>Warning</b>: Creating default object from empty value in <b>/home/jun/moodles/stable_master/moodle/mod/assign/submission/file/locallib.php</b> on line <b>326</b><br />