Avoid crash for stss sync sample number 0 am: 5c364997a3 am: e77a32bd3d am: ab28d49e41  -s ours am: 73db408aa3 am: 0bb0a8e1e8 am: 4d86bef7f7 am: 241f5feb8a am: a7cec6180f am: d022170614 am: cbdc2b7899 am: c9f14c3442 am: 08bb4c4a5b
am: f3bab7a1de

Change-Id: I9346333d4f06e7f261a2f7b1e9ea92c29966a80c