Prevent a null pointer exception.

Change-Id: I6daa89bebcfd1168c76d214cf56ad1e9c18b2a58
diff --git a/src/com/android/browser/BrowserActivity.java b/src/com/android/browser/BrowserActivity.java
index 4b7afd2..9d1e38f 100644
--- a/src/com/android/browser/BrowserActivity.java
+++ b/src/com/android/browser/BrowserActivity.java
@@ -3126,7 +3126,10 @@
      * Update the lock icon to correspond to our latest state.
      */
     private void updateLockIconToLatest() {
-        updateLockIconImage(mTabControl.getCurrentTab().getLockIconType());
+        Tab t = mTabControl.getCurrentTab();
+        if (t != null) {
+            updateLockIconImage(t.getLockIconType());
+        }
     }
 
     /**