Testing difficulty: EASY Testing environment: A course with a workshop and at least two students enrolled. Prepare a workshop with a simple assessment form of any strategy. Switch the workshop to the submission phase and let students submit their work. Allocate the submissions so that each submission is assessed by just one peer-reviewer. For at least one submission, set the assessment weight to zero for all allocated assessments (that means the only one in our case). Switch the workshop to the assessment phase and let students assess allocated submissions. Switch the workshop to the grading evaluation phase and make sure the grading evaluation method is set to the "Comparison with the best assessment". Click the "Re-calculate grades" button. TEST: Make sure no coding exception is thrown. The reviewer does not get any grade for their zero-weighted assessment. As a teacher, provide additional assessment for the submission beside the one with zero grade. Keep the weight of this teacher's assessment higher than zero. Re-calculate the grades again. TEST: The grading grade (grade for assessment) for the assessment with the zero weight should now be calculated (and will probably be very low or zero).