From af85370b7eac58fe69c888310de6f2fcbb9cc4d8 Mon Sep 17 00:00:00 2001
From: Eitan Isaacson <eitan@monotonous.org>
Date: Fri, 20 Dec 2013 11:14:26 -0800
Subject: [PATCH] Bug 952141 - Fix error when user lifts finger with no valid
 vc position. r=yzen

---
 accessible/src/jsat/content-script.js | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/accessible/src/jsat/content-script.js b/accessible/src/jsat/content-script.js
index a7800644ca08..cc127bc08a6d 100644
--- a/accessible/src/jsat/content-script.js
+++ b/accessible/src/jsat/content-script.js
@@ -163,9 +163,14 @@ function forwardToChild(aMessage, aListener, aVCPosition) {
 function activateCurrent(aMessage) {
   Logger.debug('activateCurrent');
   function activateAccessible(aAccessible) {
-    if (aMessage.json.activateIfKey &&
-        aAccessible.role != Roles.KEY) {
-      // Only activate keys, don't do anything on other objects.
+    try {
+      if (aMessage.json.activateIfKey &&
+          aAccessible.role != Roles.KEY) {
+        // Only activate keys, don't do anything on other objects.
+        return;
+      }
+    } catch (e) {
+      // accessible is invalid. Silently fail.
       return;
     }