Fix potential NPE

        Key key = onDownKey(x, y, eventTime);

        // Sliding key is allowed when 1) enabled by configuration, 2) this pointer starts sliding

        // from modifier key, or 3) this pointer's KeyDetector always allows sliding input.

        mIsAllowedSlidingKeyInput = sConfigSlidingKeyInputEnabled || key.isModifier()

        mIsAllowedSlidingKeyInput = sConfigSlidingKeyInputEnabled

                || (key != null && key.isModifier())

                || mKeyDetector.alwaysAllowsSlidingInput();

        mKeyboardLayoutHasBeenChanged = false;

        mKeyAlreadyProcessed = false;