diff --git a/classes/studyitem.php b/classes/studyitem.php
index 59bb4e0..07d44a8 100644
--- a/classes/studyitem.php
+++ b/classes/studyitem.php
@@ -569,7 +569,9 @@ class studyitem {
         // Add course if available.
         if (courseinfo::exists($this->r->course_id)) {
             $cinfo = $this->getcourseinfo();
-            $model['course'] = $cinfo->user_model($userid);
+            if (is_object($cinfo)) {
+                $model['course'] = $cinfo->user_model($userid);
+            }
         }
 
         // Add incoming and outgoing connection info.
@@ -608,7 +610,11 @@ class studyitem {
             if (strtolower($this->r->type) == 'course') {
                 // Determine competency by competency completion.
                 $courseinfo = $this->getcourseinfo();
-                return $this->aggregator->aggregate_course($courseinfo, $this, $userid);
+                if (is_object($courseinfo)) {
+                    return $this->aggregator->aggregate_course($courseinfo, $this, $userid);
+                } else {
+                    return completion::INCOMPLETE;
+                }
             } else if (strtolower($this->r->type) == 'start') {
                 // Does not need to use aggregator.
                 // Either true, or the completion of the reference.