Create some question in Question bank, and export it using Moodle XML format.

Than try to import that question. Following error occurs:

Coding error detected, it must be fixed by a programmer: Invalid database query parameter value

This can be found in error log:

[12-Aug-2014 17:58:00 Europe/Belgrade] Database transaction aborted automatically in /home/vukas/moodles/bombardier/moodle/question/import.php
[12-Aug-2014 17:58:00 Europe/Belgrade] Default exception handler: Coding error detected, it must be fixed by a programmer: Invalid database query parameter value Debug: Objects are are not allowed: context_course
Error code: codingerror

• line 782 of /lib/dml/moodle_database.php: coding_exception thrown
• line 783 of /lib/dml/mysqli_native_moodle_database.php: call to moodle_database->detect_objects()
• line 1141 of /lib/dml/mysqli_native_moodle_database.php: call to mysqli_native_moodle_database->normalise_value()
• line 1015 of /tag/lib.php: call to mysqli_native_moodle_database->insert_record()
• line 168 of /tag/lib.php: call to tag_assign()
• line 429 of /question/format.php: call to tag_set()
• line 119 of /question/import.php: call to qformat_default->importprocess()