Fix a possible NPE

Change-Id: I5c57752772414b4f9475d0ad43d7fc52b97c3f33
diff --git a/java/src/com/android/inputmethod/latin/Settings.java b/java/src/com/android/inputmethod/latin/Settings.java
index b79c441..1e2ef48 100644
--- a/java/src/com/android/inputmethod/latin/Settings.java
+++ b/java/src/com/android/inputmethod/latin/Settings.java
@@ -336,7 +336,9 @@
                 R.string.auto_correction_threshold_mode_index_off);
         final String currentSetting = mAutoCorrectionThresholdPreference.getValue();
         mBigramSuggestion.setEnabled(!currentSetting.equals(autoCorrectionOff));
-        mBigramPrediction.setEnabled(!currentSetting.equals(autoCorrectionOff));
+        if (null != mBigramPrediction) {
+            mBigramPrediction.setEnabled(!currentSetting.equals(autoCorrectionOff));
+        }
     }
 
     public Activity getActivityInternal() {