diff --git a/common/lib/xmodule/xmodule/open_ended_grading_classes/combined_open_ended_modulev1.py b/common/lib/xmodule/xmodule/open_ended_grading_classes/combined_open_ended_modulev1.py
index 12f90ed1b3..6767851d3a 100644
--- a/common/lib/xmodule/xmodule/open_ended_grading_classes/combined_open_ended_modulev1.py
+++ b/common/lib/xmodule/xmodule/open_ended_grading_classes/combined_open_ended_modulev1.py
@@ -803,6 +803,18 @@ class CombinedOpenEndedV1Module():
 
         return progress_object
 
+    def out_of_sync_error(self, get, msg=''):
+        """
+        return dict out-of-sync error message, and also log.
+        """
+        #This is a dev_facing_error
+        log.warning("Combined module state out sync. state: %r, get: %r. %s",
+                    self.state, get, msg)
+        #This is a student_facing_error
+        return {'success': False,
+                'error': 'The problem state got out-of-sync.  Please try reloading the page.'}
+
+
 
 class CombinedOpenEndedV1Descriptor():
     """
diff --git a/common/lib/xmodule/xmodule/tests/test_combined_open_ended.py b/common/lib/xmodule/xmodule/tests/test_combined_open_ended.py
index 7cfec5fb62..3b8019290f 100644
--- a/common/lib/xmodule/xmodule/tests/test_combined_open_ended.py
+++ b/common/lib/xmodule/xmodule/tests/test_combined_open_ended.py
@@ -604,8 +604,10 @@ class OpenEndedModuleXmlTest(unittest.TestCase):
             #This error is okay.  We don't have a grading service to connect to!
             pass
 
+        #Try to get the rubric from the module
         module.handle_ajax("get_combined_rubric", {})
 
+        #Make a fake reply from the queue
         queue_reply = {
             'queuekey' : "",
             'xqueue_body' : json.dumps({
@@ -620,5 +622,20 @@ class OpenEndedModuleXmlTest(unittest.TestCase):
             })
         }
 
+        module.handle_ajax("check_for_score", {})
+
+        #Update the module with the fake queue reply
         module.handle_ajax("score_update", queue_reply)
 
+        #Get html and other data client will request
+        html = module.get_html()
+        legend = module.handle_ajax("get_legend", {})
+        status = module.handle_ajax("get_status", {})
+        legend = module.handle_ajax("skip_post_assessment", {})
+
+        #Get all results
+        legend = module.handle_ajax("get_results", {})
+
+        log.info(module.task_states)
+        #reset the problem
+        module.handle_ajax("reset", {})