Learning Progress: / by zero
14:39:51,914 ERROR http-apr-127.0.0.1-8080-exec-80 controller.AbstractControllerExceptionHandler:33 - / by zero
java.lang.ArithmeticException: / by zero
at de.thm.arsnova.domain.PointBasedLearningProgress.createCourseProgress(PointBasedLearningProgress.java:39)