1 files changed, 1 insertions, 1 deletions
diff --git a/src/library_gl.js b/src/library_gl.js
index 6f363458..9928a9cc 100644
--- a/src/library_gl.js
+++ b/src/library_gl.js
@@ -39,7 +39,7 @@ var LibraryGL = {
                 return i;
               }
             }
-            return null;
+            return 0;
           },
           remove: function(id) {
             if( id == 0 ) return;