Index: lib/filterStorage.js
===================================================================
--- a/lib/filterStorage.js
+++ b/lib/filterStorage.js
@@ -761,17 +761,17 @@
             this.wantObj = true;
             this.curObj = {};
             break;
           case "subscription filters":
             this.wantObj = false;
             this.curObj = [];
             break;
           default:
-            this.wantObj = undefined;
+            this.wantObj = null;
             this.curObj = null;
         }
       }
       else if (this.wantObj === false && val)
         this.curObj.push(val.replace(/\\\[/g, "["));
     }
     finally
     {