diff --git a/mobile/android/chrome/content/browser.js b/mobile/android/chrome/content/browser.js
index bfada6a2aa80..2875be2fad85 100644
--- a/mobile/android/chrome/content/browser.js
+++ b/mobile/android/chrome/content/browser.js
@@ -1717,6 +1717,10 @@ var NativeWindow = {
    *                     the checked state as an argument.                   
    */
     show: function(aMessage, aValue, aButtons, aTabID, aOptions) {
+      if (aButtons == null) {
+        aButtons = [];
+      }
+
       aButtons.forEach((function(aButton) {
         this._callbacks[this._callbacksId] = { cb: aButton.callback, prompt: this._promptId };
         aButton.callback = this._callbacksId;