This issue is similar to the one reported here #103. We had this issue reported as well, but it was resolved after the fix was applied. However, it seems like an edge case remains when the submission settings require students to click the submit button:
In this case, if:
- Mahara submissions are enabled together with File and/or Online text submissions;
- The student submits only a File and/or Online text, but no Mahara portfolio;
When the student clicks the 'Submit' button, the following error is displayed on the screen:
Would you be able to investigate this one too?