diff --git a/README.md b/README.md
index f839024..5c43902 100644
--- a/README.md
+++ b/README.md
@@ -391,7 +391,7 @@ The signalflow client can be built for usage in a browser. This is accomplished
 
 ```
 $ npm install
-$ gulp browserify
+$ npm run build:browser
 The output can be found at ./build/signalfx.js
 ```
 
diff --git a/lib/client/signalflow/signalflow_client.js b/lib/client/signalflow/signalflow_client.js
index 952ba4a..9fcac94 100644
--- a/lib/client/signalflow/signalflow_client.js
+++ b/lib/client/signalflow/signalflow_client.js
@@ -32,6 +32,9 @@ function SignalflowClient(apiToken, options) {
     }
 
     function msgCallback(msg) {
+      // For handling the non-object typed of the 'msg' data.
+      if(!msg) return;
+
       if (msg.type === 'metadata') {
         metaDataMap[msg.tsId] = msg;
       }