Log error for assignments

The following error displays in the logs every time an assignment is submitted. The student does not see any errors . I just happened to notice this while trying to track down a problem with resubmissions. Looking through the logs, this error displays any time a student submits, including assignments that do not have resubmissions.

03-Dec-2017 12:00:24.045 ERROR [http-nio-20013-exec-3] velocity.sakai.assignment.tool.log Left side ($!submission.getSubmissionLog().size()) of '>' operation has null value at /vm/assignment/chef_assignments_student_view_submission_confirmation.vm[line 113, column 74]