ZendeskSDKConversationKit crash

Hi. We are using: 

ZendeskSDK 3.15.0

ZendeskSDKConversationKit 13.2.0

We observe the crashes, could you please support? 

Crashed: com.apple.root.default-qos

EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x00000009a3c36598
 Crashed: com.apple.root.default-qos
0  libobjc.A.dylib                0x5dac objc_class::realizeIfNeeded() + 24
1  libobjc.A.dylib                0x5ea8 objc_destructInstance + 36
2  libswiftCore.dylib             0x399838 swift_deallocClassInstance + 112
3  libswiftCore.dylib             0x39978c _swift_release_dealloc + 56
4  libswiftCore.dylib             0x39a700 bool swift::RefCounts<swift::RefCountBitsT<(swift::RefCountInlinedness)1>>::doDecrementSlow<(swift::PerformDeinit)1>(swift::RefCountBitsT<(swift::RefCountInlinedness)1>, unsigned int) + 152
5  ZendeskSDKConversationKit      0x561f4 __swift_memcpy56_8 + 4572
6  ZendeskSDKConversationKit      0x56438 __swift_memcpy56_8 + 5152
7  libdispatch.dylib              0x1b584 _dispatch_client_callout + 16
8  libdispatch.dylib              0x6560 _dispatch_continuation_pop + 596
9  libdispatch.dylib              0x19348 _dispatch_source_latch_and_call + 396
10 libdispatch.dylib              0x18020 _dispatch_source_invoke + 844
11 libdispatch.dylib              0x608c _dispatch_queue_override_invoke + 484
12 libdispatch.dylib              0x13db0 _dispatch_root_queue_drain + 364
13 libdispatch.dylib              0x1454c _dispatch_worker_thread2 + 156
14 libsystem_pthread.dylib        0x9d0 _pthread_wqthread + 232
15 libsystem_pthread.dylib        0xaac start_wqthread + 8