diff --git a/java/src/com/android/inputmethod/keyboard/KeyDetector.java b/java/src/com/android/inputmethod/keyboard/KeyDetector.java
index 03d9def..87368d4 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyDetector.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyDetector.java
@@ -86,6 +86,9 @@
      * @return the key that the touch point hits.
      */
     public Key detectHitKey(final int x, final int y) {
+        if (mKeyboard == null) {
+            return null;
+        }
         final int touchX = getTouchX(x);
         final int touchY = getTouchY(y);