Wed Aug 14 17:51:19.596 [repl writer worker 5] ERROR: writer worker caught exception: can't have undefined in a query expression on: { ts: Timestamp 1376502675000|148, h: -7051208488782965113, v: 2, op: "i", ns: "invitations.invitationCollections", o: { _id: undefined, migrated: new Date(1376502667931) } }
Wed Aug 14 17:51:19.596 [repl writer worker 5]   Fatal Assertion 16360
0xdcf361 0xd8f0d3 0xc1f33c 0xd9cc01 0xe17cb9 0x7f6405e5ce9a 0x7f640516fcbd
 /usr/bin/mongod(_ZN5mongo15printStackTraceERSo+0x21) [0xdcf361]
 /usr/bin/mongod(_ZN5mongo13fassertFailedEi+0xa3) [0xd8f0d3]
 /usr/bin/mongod(_ZN5mongo7replset14multiSyncApplyERKSt6vectorINS_7BSONObjESaIS2_EEPNS0_8SyncTailE+0x12c) [0xc1f33c]
 /usr/bin/mongod(_ZN5mongo10threadpool6Worker4loopEv+0x281) [0xd9cc01]
 /usr/bin/mongod() [0xe17cb9]
 /lib/x86_64-linux-gnu/libpthread.so.0(+0x7e9a) [0x7f6405e5ce9a]
 /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7f640516fcbd]
Wed Aug 14 17:51:19.641 [repl writer worker 5]

***aborting after fassert() failure


Wed Aug 14 17:51:19.641 Got signal: 6 (Aborted).

Wed Aug 14 17:51:19.644 Backtrace:
0xdcf361 0x6cf729 0x7f64050b24a0 0x7f64050b2425 0x7f64050b5b8b 0xd8f10e 0xc1f33c 0xd9cc01 0xe17cb9 0x7f6405e5ce9a 0x7f640516fcbd
 /usr/bin/mongod(_ZN5mongo15printStackTraceERSo+0x21) [0xdcf361]
 /usr/bin/mongod(_ZN5mongo10abruptQuitEi+0x399) [0x6cf729]
 /lib/x86_64-linux-gnu/libc.so.6(+0x364a0) [0x7f64050b24a0]
 /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35) [0x7f64050b2425]
 /lib/x86_64-linux-gnu/libc.so.6(abort+0x17b) [0x7f64050b5b8b]
 /usr/bin/mongod(_ZN5mongo13fassertFailedEi+0xde) [0xd8f10e]
 /usr/bin/mongod(_ZN5mongo7replset14multiSyncApplyERKSt6vectorINS_7BSONObjESaIS2_EEPNS0_8SyncTailE+0x12c) [0xc1f33c]
 /usr/bin/mongod(_ZN5mongo10threadpool6Worker4loopEv+0x281) [0xd9cc01]
 /usr/bin/mongod() [0xe17cb9]
 /lib/x86_64-linux-gnu/libpthread.so.0(+0x7e9a) [0x7f6405e5ce9a]
 /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7f640516fcbd]