diff --git a/airtime_mvc/application/models/Playlist.php b/airtime_mvc/application/models/Playlist.php
index 7eaad0a64..7a7573d2a 100644
--- a/airtime_mvc/application/models/Playlist.php
+++ b/airtime_mvc/application/models/Playlist.php
@@ -1118,6 +1118,41 @@ SQL;
         return $real_streams;
     }
 
+    /** Find out if a playlist contains any files that have been deleted from disk.
+     *  This function relies on the "file_exists" column in the database being accurate and true,
+     *  which it should.
+     * @return boolean true if there are missing files in this playlist, false otherwise.
+     */
+    public function containsMissingFiles()
+    {
+        $playlistContents = $this->pl->getCcPlaylistcontentss("type = 0"); //type=0 is only files, not other types of media
+        
+        //Slightly faster than the other Propel version below (this one does an INNER JOIN):
+        $missingFiles = CcFilesQuery::create()
+                            ->join("CcFiles.CcPlaylistcontents")
+                            ->where("CcPlaylistcontents.DbPlaylistId = ?", $this->pl->getDbId()) 
+                            ->where("CcFiles.DbFileExists = ?", 'false')
+                            ->find();
+        
+        //Nicer Propel version but slightly slower because it generates a LEFT JOIN:
+        /*
+        $missingFiles = CcPlaylistcontentsQuery::create()
+        ->filterByDbPlaylistId($this->pl->getDbId())
+        ->useCcFilesQuery()
+        ->filterByDbFileExists(false)
+        ->endUse()
+        ->find();
+        */
+        
+        if (!$missingFiles->isEmpty())
+        {
+            return true;
+        }
+        
+        return false;        
+    }
+    
+    
 } // class Playlist
 
 class PlaylistNotFoundException extends Exception {}
diff --git a/airtime_mvc/application/models/Scheduler.php b/airtime_mvc/application/models/Scheduler.php
index 85e8f6f24..4aa1182c6 100644
--- a/airtime_mvc/application/models/Scheduler.php
+++ b/airtime_mvc/application/models/Scheduler.php
@@ -182,6 +182,22 @@ class Application_Model_Scheduler
             }
         }
     }
+    
+    private function validateMediaItems($mediaItems)
+    {
+        foreach ($mediaItems as $mediaItem)
+        {
+            $id = $mediaItem["id"];
+            if ($mediaItem["type"] === "playlist")
+            {
+                $playlist = new Application_Model_Playlist($id, $this->con);
+                if ($playlist->containsMissingFiles()) {
+                    throw new Exception(_("Cannot schedule a playlist that contains missing files."));
+                }
+            }
+        }
+        return true;
+    }
 
     /*
      * @param $id
@@ -951,6 +967,7 @@ class Application_Model_Scheduler
         $this->con->beginTransaction();
 
         try {
+            $this->validateMediaItems($mediaItems); //Check for missing files, etc.
             $this->validateRequest($scheduleItems, true);
 
             /*