An error is received when adding an Evaluation when logged in as a Student. The error is: "Failed to save submission."

The debug message is:

Field 'gradecomment' doesn't have a default value
INSERT INTO mdl_webquest_submissions
( WEBQUESTID, TITLE, DESCRIPTION, USERID, TIMECREATED )
VALUES ( 1, 'Test', '', 1, 1207258926 )
line 1419 of lib\dmllib.php: call to debugging()
line 70 of mod\webquest\upload.php: call to insert_record()

To recreate the problem:

1. Create a webquest
2. Log in as a student in the course
3. Go to the Evaluation screen
4. Enter text in Title and Submission fields
5. Click Submit Assignment button