adb backup doesn't work after COl1 update

I have a SM-P600 and adb backup doesn't work after COl1 Stagefright fix. I got the "backup finished" message on the device but the backup file is blank. It only has 41 bytes. Does anyone encounter this problem?

By the way, I also updated my Note 4 with the Stagefright fix and adb backup still works on the phone.