diff --git a/main/cron/import_csv.php b/main/cron/import_csv.php
index 65b5201c4b1..4a22d830eff 100755
--- a/main/cron/import_csv.php
+++ b/main/cron/import_csv.php
@@ -868,7 +868,6 @@ private function importCalendarStatic($file, $moveFile = true)
                     $this->logger->addInfo("external_sessionID: ".$externalSessionId." does not exists.");
                 }
                 $teacherId = null;
-
                 if (!empty($sessionId) && !empty($courseInfo)) {
                     $courseIncluded = SessionManager::relation_session_course_exist(
                         $sessionId,
@@ -944,9 +943,7 @@ private function importCalendarStatic($file, $moveFile = true)
             }
 
             if (empty($eventsToCreate)) {
-                $this->logger->addInfo(
-                    "No events to add"
-                );
+                $this->logger->addInfo("No events to add");
 
                 return 0;
             }
@@ -1045,6 +1042,34 @@ private function importCalendarStatic($file, $moveFile = true)
                             $em->flush();
                         }
                     }
+                    $this->logger->addInfo('Move from course #'.$calendarEvent->getCId().' to #'.$courseInfo['real_id']);
+
+                    // Checking if session still exists
+                    $calendarSessionId = (int) $calendarEvent->getSessionId();
+                    if (!empty($calendarSessionId)) {
+                        $calendarSessionInfo = api_get_session_info($calendarSessionId);
+                        if (empty($calendarSessionInfo)) {
+                            $calendarId = (int) $calendarEvent->getIid();
+
+                            // Delete calendar events because the session was deleted!
+                            $this->logger->addInfo(
+                                "Delete event # $calendarId because session # $calendarSessionId doesn't exist"
+                            );
+
+                            $sql = "DELETE FROM c_calendar_event 
+                                    WHERE iid = $calendarId AND session_id = $calendarSessionId";
+                            Database::query($sql);
+                            $this->logger->addInfo($sql);
+
+                            $sql = "DELETE FROM c_item_property 
+                                    WHERE 
+                                        tool = 'calendar_event' AND 
+                                        ref = $calendarSessionId AND 
+                                        session_id = $calendarSessionId";
+                            Database::query($sql);
+                            $this->logger->addInfo($sql);
+                        }
+                    }
                 } else {
                     $this->logger->addInfo('Calendar event not found '.$item['item_id']);
                 }
diff --git a/src/Chamilo/CourseBundle/Entity/CCalendarEvent.php b/src/Chamilo/CourseBundle/Entity/CCalendarEvent.php
index 8ce58531c8a..2d552f717f1 100644
--- a/src/Chamilo/CourseBundle/Entity/CCalendarEvent.php
+++ b/src/Chamilo/CourseBundle/Entity/CCalendarEvent.php
@@ -378,4 +378,22 @@ public function setColor($color)
 
         return $this;
     }
+
+    /**
+     * @return int
+     */
+    public function getIid()
+    {
+        return $this->iid;
+    }
+
+    /**
+     * @param int $iid
+     * @return CCalendarEvent
+     */
+    public function setIid($iid)
+    {
+        $this->iid = $iid;
+        return $this;
+    }
 }