Index: lams_central/src/java/org/lamsfoundation/lams/web/LoginRequestServlet.java
===================================================================
diff -u -rc975a1230b65f2245c5c77ba413afe97a2816df9 -r747fe11ce646f06d9cfbe92df073af47a4eb83d8
--- lams_central/src/java/org/lamsfoundation/lams/web/LoginRequestServlet.java	(.../LoginRequestServlet.java)	(revision c975a1230b65f2245c5c77ba413afe97a2816df9)
+++ lams_central/src/java/org/lamsfoundation/lams/web/LoginRequestServlet.java	(.../LoginRequestServlet.java)	(revision 747fe11ce646f06d9cfbe92df073af47a4eb83d8)
@@ -152,7 +152,7 @@
 	    // in case of request for learner with strict authentication check cache should also contain lsid
 	    String lsId = request.getParameter(IntegrationConstants.PARAM_LESSON_ID);
 	    if ((IntegrationConstants.METHOD_LEARNER_STRICT_AUTHENTICATION.equals(method)
-		    || IntegrationConstants.METHOD_MONITOR.equals(method)) && lsId == null) {
+		    || IntegrationConstants.METHOD_MONITOR.equals(method)) && StringUtils.isBlank(lsId)) {
 		response.sendError(HttpServletResponse.SC_BAD_REQUEST, "Login Failed - lsId parameter missing");
 		return;
 	    }