Markbook bug for a student who could not sit for a test

Good evening,

I am an enthusiastic user of Gibbon. Our school in Kenya has just embraced now the reports module and we are so amazed of the capacities of this module.

We are also using the markbook and I would have a question about a difficulty I could not solve alone. Some children could not sit for some exams and have not received a mark in the markbook. The result of that is the bug of the markbook of this specific student, with this message about the escaped gibbons… This situation arrives also if a child join in the course of the term and has no marks for the precedent tests…

Maybe you have an advice to give me? How can we handle this bug?

Thank you so much for your kind assistance.

Fr… Pierre Champroux