--- a/mobile/android/chrome/content/browser.js
+++ b/mobile/android/chrome/content/browser.js
@@ -1245,37 +1245,39 @@ var BrowserApp = {
     evt.initUIEvent("TabClose", true, false, window, tabIndex);
     aTab.browser.dispatchEvent(evt);
 
     if (aShowUndoSnackbar) {
       // Get a title for the undo close snackbar. Fall back to the URL if there is no title.
       let ss = Cc["@mozilla.org/browser/sessionstore;1"].getService(Ci.nsISessionStore);
       let closedTabData = ss.getClosedTabs(window)[0];
 
-      let message;
-      let title = closedTabData.entries[closedTabData.index - 1].title;
-      let isPrivate = PrivateBrowsingUtils.isBrowserPrivate(aTab.browser);
-
-      if (isPrivate) {
-        message = Strings.browser.GetStringFromName("privateClosedMessage.message");
-      } else if (title) {
-        message = Strings.browser.formatStringFromName("undoCloseToast.message", [title], 1);
-      } else {
-        message = Strings.browser.GetStringFromName("undoCloseToast.messageDefault");
-      }
-
-      Snackbars.show(message, Snackbars.LENGTH_LONG, {
-        action: {
-          label: Strings.browser.GetStringFromName("undoCloseToast.action2"),
-          callback: function() {
-            UITelemetry.addEvent("undo.1", "toast", null, "closetab");
-            ss.undoCloseTab(window, closedTabData);
+      if (closedTabData) {
+        let message;
+        let title = closedTabData.entries[closedTabData.index - 1].title;
+        let isPrivate = PrivateBrowsingUtils.isBrowserPrivate(aTab.browser);
+
+        if (isPrivate) {
+          message = Strings.browser.GetStringFromName("privateClosedMessage.message");
+        } else if (title) {
+          message = Strings.browser.formatStringFromName("undoCloseToast.message", [title], 1);
+        } else {
+          message = Strings.browser.GetStringFromName("undoCloseToast.messageDefault");
+        }
+
+        Snackbars.show(message, Snackbars.LENGTH_LONG, {
+          action: {
+            label: Strings.browser.GetStringFromName("undoCloseToast.action2"),
+            callback: function() {
+              UITelemetry.addEvent("undo.1", "toast", null, "closetab");
+              ss.undoCloseTab(window, closedTabData);
+            }
           }
-        }
-      });
+        });
+      }
     }
 
     aTab.destroy();
     this._tabs.splice(tabIndex, 1);
   },
 
   // Use this method to select a tab from JS. This method sends a message
   // to Java to select the tab in the Java UI (we'll get a Tab:Selected message