Index: gradebook/service/impl/src/java/org/sakaiproject/component/gradebook/GradebookServiceHibernateImpl.java
===================================================================
--- gradebook/service/impl/src/java/org/sakaiproject/component/gradebook/GradebookServiceHibernateImpl.java (revision 64905)
+++ gradebook/service/impl/src/java/org/sakaiproject/component/gradebook/GradebookServiceHibernateImpl.java (working copy)
@@ -841,7 +841,8 @@
    }   
    public void updateExternalAssessmentScore(String gradebookUid, String externalId,
            String studentUid, Double points) throws GradebookNotFoundException, AssessmentNotFoundException {
-       externalAssessmentService.updateExternalAssessmentScore(gradebookUid, externalId, studentUid, points.toString());
+       String strPoints = (points == null ? null : points.toString());
+        externalAssessmentService.updateExternalAssessmentScore(gradebookUid, externalId, studentUid, strPoints);
    }   
    public void updateExternalAssessmentScores(String gradebookUid, String externalId, Map studentUidsToScores)
        throws GradebookNotFoundException, AssessmentNotFoundException {