ios - 'NSInternalInconsistencyException', reason: 'Unrecognized database version: ' Firebase crash on physical device -

my app keeps crashing on physical device, works on simulator. , can't find information on bug. using firebase. app has been working fine while , randomly occurs.

2016-08-08 14:50:14.081 gameofchats[1626:570752] * terminating app due uncaught exception 'nsinternalinconsistencyexception', reason: 'unrecognized database version: ' * first throw call stack: (0x182462db0 0x181ac7f80 0x182462cf8 0x1001b1bc8 0x1001b1ab0 0x1001c2a84 0x100ed5a7c 0x100ed5a3c 0x100ee2554 0x100ed972c 0x100ee466c 0x100ee4364 0x1820c5470 0x1820c5020) libc++abi.dylib: terminating uncaught exception of type nsexception

i've faced more or less same issue.

i remove app device , let xcode install fresh copy of , solved issue.

my guess somehow local firebase cache must have been corrupted , each time firebase's sdk tried access app crashs.