Index: lams_central/src/java/org/lamsfoundation/lams/webservice/SPEnrolmentServlet.java
===================================================================
diff -u -rc645ab6608d429118e4c526f79130878ec210257 -r286ef7c98baa533571da3d6af47ebc0aff0742f4
--- lams_central/src/java/org/lamsfoundation/lams/webservice/SPEnrolmentServlet.java	(.../SPEnrolmentServlet.java)	(revision c645ab6608d429118e4c526f79130878ec210257)
+++ lams_central/src/java/org/lamsfoundation/lams/webservice/SPEnrolmentServlet.java	(.../SPEnrolmentServlet.java)	(revision 286ef7c98baa533571da3d6af47ebc0aff0742f4)
@@ -156,10 +156,13 @@
 		}
 
 		for (String role : Mode.getAllRoles()) {
+		    List<List<String>> lines = linesByMode.get(role);
+		    if (lines == null) {
+			continue;
+		    }
+		    
 		    logger.info("Processing \"" + role + "\" role");
 
-		    List<List<String>> lines = linesByMode.get(role);
-
 		    // it is easier to detect whether we process managers or staff or learners just once
 		    // than for each user - they do not come together anyway
 		    final Mode mode = role.equals(Mode.STAFF.getRole()) ? Mode.STAFF