fix crash on client side
fix crash on client side

Change-Id: Ia7a3d8927ecad7d354f5e64dea53915aedec7e2e
Reviewed-on: http://cr.qtquick.me/640
Reviewed-by: Takahiro Hashimoto <b59128e2582a625f3a4337ede555b631692b1b94@qtquick.me>
Tested-by: Takahiro Hashimoto <b59128e2582a625f3a4337ede555b631692b1b94@qtquick.me>
Reviewed-by: Tasuku Suzuki <42980d970444f9101663582e70cd53623b3238b4@gmail.com>
Tested-by: Tasuku Suzuki <42980d970444f9101663582e70cd53623b3238b4@gmail.com>

qt-users-jp/qimsys,qt-users-jp/qimsys,qt-users-jp/qimsys,qt-users-jp/qimsys