guard for fn

TracerBench · Feb 4, 2016 · 19a84ad · 19a84ad
1 parent 71c6c94
commit 19a84ad
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/lib/debugging-protocol-factory.ts b/lib/debugging-protocol-factory.ts
@@ -119,7 +119,9 @@ class Domain {
               this._client.removeListener(prefixed, listener);
             }
             listener = v;
-            this._client.on(prefixed, v);
+            if (v) {
+              this._client.on(prefixed, v);
+            }
           }
         });
       });