apollo-ios: Crashed: com.apollographql.DataLoader - Statement.swift line 226

We’ve deployed Apollo iOS 0.6.4 and we’re getting a few crashes in the data loader thread…

Stack trace is:

#7. Crashed: com.apollographql.DataLoader
0  libswiftCore.dylib             0x1d1b468 _TTSfq4n_s_n_n_n___TFs17_assertionFailureFTVs12StaticStringSS4fileS_4lineSu5flagsVs6UInt32_Os5Never + 160
1  libswiftCore.dylib             0x1d68778 _TPA__TFFs17_assertionFailureFTVs12StaticStringSS4fileS_4lineSu5flagsVs6UInt32_Os5NeverU_FGSRVs5UInt8_T_ + 216
2  libswiftCore.dylib             0x1bfc398 swift_unexpectedError_merged + 334
3  libswiftCore.dylib             0x1bfc224 swift_unexpectedError + 34
4  MyApp                       0x1152f58 specialized Connection.(prepare(QueryType) throws -> AnySequence<Row>).(closure #2).(closure #1) (Statement.swift:226)
5  MyApp                       0x1156860 partial apply for Connection.(prepare(QueryType) throws -> AnySequence<Row>).(closure #2).(closure #1) (Query.swift)
6  MyApp                       0x11568bc partial apply for thunk (Query.swift)
7  libswiftCore.dylib             0x1cf0a88 _TFVs21_ClosureBasedIterator4nextfT_GSqx_ + 40
8  libswiftCore.dylib             0x1cf0ab8 _TTWurGVs21_ClosureBasedIteratorx_s16IteratorProtocolsFS0_4nextfT_GSqwx7Element_ + 44
9  libswiftCore.dylib             0x1cf0b80 _TFCs12_IteratorBox4nextfT_GSqwx7Element_ + 36
10 libswiftCore.dylib             0x1bef008 _TFVs11AnyIterator4nextfT_GSqx_ + 20
11 libswiftCore.dylib             0x1cf02d0 _TTWurGVs11AnyIteratorx_s16IteratorProtocolsFS0_4nextfT_GSqwx7Element_ + 36
12 libswiftCore.dylib             0x1b94ce8 _TFEsPs8Sequence3mapurfzFzWx8Iterator7Element_qd__GSaqd___ + 988
13 libswiftCore.dylib             0x1cfe04c _TTWuRxs16IteratorProtocolrGVs21_ClosureBasedSequencex_s8SequencesFS1_3mapurfzFzWx8Iterator7Element_qd__GSaqd___ + 116
14 libswiftCore.dylib             0x1cf17ac _TFCs12_SequenceBox4_mapurfzFzWx8Iterator7Element_qd__GSaqd___ + 164
15 MyApp                       0xb8e804 specialized SQLiteNormalizedCache.selectRecords(forKeys : [String]) throws -> [Record] (SQLiteNormalizedCache.swift:76)
16 MyApp                       0xb8f5b8 specialized SQLiteNormalizedCache.(loadRecords(forKeys : [String]) -> Promise<[Record?]>).(closure #1) (SQLiteNormalizedCache.swift)
17 MyApp                       0xb8fd60 specialized SQLiteNormalizedCache.loadRecords(forKeys : [String]) -> Promise<[Record?]> (SQLiteNormalizedCache.swift)
18 MyApp                       0xb1bf48 protocol witness for NormalizedCache.loadRecords(forKeys : [String]) -> Promise<[Record?]> in conformance SQLiteNormalizedCache (SQLiteNormalizedCache.swift)
19 MyApp                       0xb633b4 partial apply (NormalizedCache.swift)
20 MyApp                       0xb321fc specialized specialized DataLoader.(dispatch() -> ()).(closure #1) (DataLoader.swift:48)
21 MyApp                       0xb2f998 specialized DataLoader.(dispatch() -> ()).(closure #1) (DataLoader.swift)
22 libdispatch.dylib              0x20ac9823 _dispatch_call_block_and_release + 10
23 libdispatch.dylib              0x20ad6423 _dispatch_queue_drain$VARIANT$mp + 1758
24 libdispatch.dylib              0x20ad5a61 _dispatch_queue_invoke$VARIANT$mp + 284
25 libdispatch.dylib              0x20ad85e9 _dispatch_root_queue_drain + 1560
26 libdispatch.dylib              0x20ad7fcd _dispatch_worker_thread3 + 96
27 libsystem_pthread.dylib        0x20c8db29 _pthread_wqthread + 1024
28 libsystem_pthread.dylib        0x20c8d718 start_wqthread + 8

Is there any other info that might be useful? Happy to work it directly with somebody who might know the implementation.