应用程序崩溃，但没有错误消息

Question

我构建的应用程序崩溃了一段时间，非常少见。但我没有看到日志中的任何错误。然后我去检查手机注册的崩溃日志。在这里。

Date/Time:           2017-09-07 20:34:18.0665 +0800
Launch Time:         2017-09-07 20:31:30.9688 +0800
OS Version:          iPhone OS 10.3.3 (14G60)
Report Version:      104

Exception Type:  EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x0000000185be7404
Termination Signal: Trace/BPT trap: 5
Termination Reason: Namespace SIGNAL, Code 0x5
Terminating Process: exc handler [0]
Triggered by Thread:  0

Application Specific Information:
*** CFHash() called with NULL ***

Filtered syslog:
None found

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   CoreFoundation                  0x0000000185be7404 0x185be2000 + 21508
1   CoreFoundation                  0x0000000185be3eec 0x185be2000 + 7916
2   CoreFoundation                  0x0000000185be3eec 0x185be2000 + 7916
3   CoreFoundation                  0x0000000185be3df4 0x185be2000 + 7668
4   CoreFoundation                  0x0000000185cb0798 0x185be2000 + 845720
5   CoreFoundation                  0x0000000185d4ab18 0x185be2000 + 1477400
6   CoreFoundation                  0x0000000185d50614 0x185be2000 + 1500692
7   CoreFoundation                  0x0000000185cb386c 0x185be2000 + 858220
8   CoreFoundation                  0x0000000185cb3130 0x185be2000 + 856368
9   CoreFoundation                  0x0000000185cb3754 0x185be2000 + 857940
10  CoreFoundation                  0x0000000185d50578 0x185be2000 + 1500536
11  Foundation                      0x000000018670611c 0x1866f9000 + 53532
12  WeStar                          0x00000001000f6a54 0x1000b4000 + 272980
13  WeStar                          0x00000001000f4708 0x1000b4000 + 263944
14  WeStar                          0x00000001000ef9f0 0x1000b4000 + 244208
15  UIKit                           0x000000018be40b04 0x18be31000 + 64260
16  UIKit                           0x000000018be58590 0x18be31000 + 161168
17  UIKit                           0x000000018bfdce18 0x18be31000 + 1752600
18  UIKit                           0x000000018bef77bc 0x18be31000 + 812988
19  UIKit                           0x000000018bef7424 0x18be31000 + 812068
20  UIKit                           0x000000018bef7388 0x18be31000 + 811912
21  UIKit                           0x000000018be3dcc0 0x18be31000 + 52416
22  QuartzCore                      0x000000018902e274 0x188f17000 + 1143412
23  QuartzCore                      0x0000000189022de8 0x188f17000 + 1097192
24  QuartzCore                      0x0000000189022ca8 0x188f17000 + 1096872
25  QuartzCore                      0x0000000188f9e34c 0x188f17000 + 553804
26  QuartzCore                      0x0000000188fc53ac 0x188f17000 + 713644
27  QuartzCore                      0x0000000188fc5e78 0x188f17000 + 716408
28  CoreFoundation                  0x0000000185cbc9a8 0x185be2000 + 895400
29  CoreFoundation                  0x0000000185cba630 0x185be2000 + 886320
30  CoreFoundation                  0x0000000185cbaa7c 0x185be2000 + 887420
31  CoreFoundation                  0x0000000185beada4 0x185be2000 + 36260
32  GraphicsServices                0x0000000187655074 0x187649000 + 49268
33  UIKit                           0x000000018bea5c9c 0x18be31000 + 478364
34  WeStar                          0x00000001001656a8 0x1000b4000 + 726696
35  libdyld.dylib                   0x0000000184bf959c 0x184bf5000 + 17820

我将如何确定这个问题？

根据我的观察，崩溃发生在主线程上。但这就是我在这里可以看到的一切。请帮忙。

-----编辑v1.0 -------

现在我有了这个符号化的崩溃日志。但是我仍然不知道这里发生了什么......