diff --git a/src/tilemap/Tileset.js b/src/tilemap/Tileset.js
index 5d61ef2e2..2b6bb57ee 100644
--- a/src/tilemap/Tileset.js
+++ b/src/tilemap/Tileset.js
@@ -217,6 +217,10 @@ Phaser.Tileset.prototype = {
                 alpha: alpha
             });
         }
+        else
+        {
+            console.warn("invalid tile index in drawGl", index, this.firstgid, this.name);
+        }
 
     },