接入环信后，app装一段时间之后就打不开了，打开就崩溃，看看崩溃日志

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   Chat                        0x000000010021febc -[HSPLChatQusController viewDidLoad] (HSPLChatQusController.m:500)
1   Chat                        0x000000010021febc -[HSPLChatQusController viewDidLoad] (HSPLChatQusController.m:500)
2   UIKit                             0x000000018a06f610 -[UIViewController loadViewIfRequired] + 1124
3   UIKit                             0x000000018a0876ec -[UIViewController __viewWillAppear:] + 132
4   UIKit                             0x000000018a21bd68 -[UINavigationController _startCustomTransition:] + 1044
5   UIKit                             0x000000018a12b430 -[UINavigationController _startDeferredTransitionIfNeeded:] + 688
6   UIKit                             0x000000018a12b10c -[UINavigationController __viewWillLayoutSubviews] + 60
7   UIKit                             0x000000018a12b074 -[UILayoutContainerView layoutSubviews] + 208
8   UIKit                             0x000000018a06aff0 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 644
9   QuartzCore                        0x0000000189871f14 -[CALayer layoutSublayers] + 148
10  QuartzCore                        0x000000018986cb20 CA::Layer::layout_if_needed(CA::Transaction*) + 292
11  QuartzCore                        0x000000018986c9e0 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 32
12  QuartzCore                        0x000000018986c07c CA::Context::commit_transaction(CA::Transaction*) + 252
13  QuartzCore                        0x000000018986bdd0 CA::Transaction::commit() + 516
14  UIKit                             0x000000018a06121c _afterCACommitHandler + 180
15  CoreFoundation                    0x0000000184acfc30 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32
16  CoreFoundation                    0x0000000184acd9d4 __CFRunLoopDoObservers + 372
17  CoreFoundation                    0x0000000184acde04 __CFRunLoopRun + 928
18  CoreFoundation                    0x00000001849fcdc0 CFRunLoopRunSpecific + 384
19  GraphicsServices                  0x000000018fb50088 GSEventRunModal + 180
20  UIKit                             0x000000018a0d6f44 UIApplicationMain + 204
21  Chat                        0x00000001003ef7c8 main (main.m:14)
22  libdyld.dylib                     0x0000000199e4a8b8 start + 4

Thread 1:
0   libsystem_kernel.dylib            0x0000000199f67c0c __workq_kernreturn + 8
1   libsystem_pthread.dylib           0x000000019a02d538 _pthread_wqthread + 1284
2   libsystem_pthread.dylib           0x000000019a02d028 start_wqthread + 4

Thread 2 name:  Dispatch queue: com.apple.libdispatch-manager
Thread 2:
0   libsystem_kernel.dylib            0x0000000199f6859c kevent_qos + 8
1   libdispatch.dylib                 0x00000001016b2328 0x10169c000 + 90920
2   libdispatch.dylib                 0x000000010169ffac 0x10169c000 + 16300

Thread 3 name:  gputools.smt_poll.0x14e55c5e0
Thread 3:
0   libsystem_kernel.dylib            0x0000000199f674e0 __semwait_signal + 8
1   libsystem_c.dylib                 0x0000000199e85e2c nanosleep + 212
2   libsystem_c.dylib                 0x0000000199e85d4c usleep + 68
3   GPUToolsCore                      0x000000010170cae0 0x101704000 + 35552
4   libsystem_pthread.dylib           0x000000019a02fb3c _pthread_body + 156
5   libsystem_pthread.dylib           0x000000019a02faa0 _pthread_body + 0
6   libsystem_pthread.dylib           0x000000019a02d030 thread_start + 4

Thread 4 name:  com.apple.NSURLConnectionLoader
Thread 4:
0   ???                               0x0000000191c905f0 0 + 6740837872
1   CoreFoundation                    0x0000000184acde6c __CFRunLoopRun + 1032
2   CoreFoundation                    0x00000001849fcdc0 CFRunLoopRunSpecific + 384
3   CFNetwork                         0x000000018429a074 +[NSURLConnection(Loader) _resourceLoadLoop:] + 412
4   Foundation                        0x0000000185a57138 __NSThread__start__ + 1000
5   libsystem_pthread.dylib           0x000000019a02fb3c _pthread_body + 156
6   libsystem_pthread.dylib           0x000000019a02faa0 _pthread_body + 0
7   libsystem_pthread.dylib           0x000000019a02d030 thread_start + 4

Thread 5:
0   libsystem_kernel.dylib            0x0000000199f67c0c __workq_kernreturn + 8
1   libsystem_pthread.dylib           0x000000019a02d538 _pthread_wqthread + 1284
2   libsystem_pthread.dylib           0x000000019a02d028 start_wqthread + 4

Thread 6:
0   libsystem_kernel.dylib            0x0000000199f67c0c __workq_kernreturn + 8
1   libsystem_pthread.dylib           0x000000019a02d538 _pthread_wqthread + 1284
2   libsystem_pthread.dylib           0x000000019a02d028 start_wqthread + 4

Thread 7 name:  com.apple.CFSocket.private
Thread 7:
0   libsystem_kernel.dylib            0x0000000199f67408 __select + 8
1   CoreFoundation                    0x0000000184ad66d0 __CFSocketManager + 648
2   libsystem_pthread.dylib           0x000000019a02fb3c _pthread_body + 156
3   libsystem_pthread.dylib           0x000000019a02faa0 _pthread_body + 0
4   libsystem_pthread.dylib           0x000000019a02d030 thread_start + 4

Thread 8 name:  GCDAsyncSocket-CFStream
Thread 8:
0   libsystem_kernel.dylib            0x0000000199f4cc30 mach_msg_trap + 8
1   libsystem_kernel.dylib            0x0000000199f4caac mach_msg + 72
2   CoreFoundation                    0x0000000184ad0168 __CFRunLoopServiceMachPort + 196
3   CoreFoundation                    0x0000000184acde6c __CFRunLoopRun + 1032
4   CoreFoundation                    0x00000001849fcdc0 CFRunLoopRunSpecific + 384
5   Foundation                        0x00000001859707ec -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 308
6   Chat                        0x000000010051c4c8 +[EMGCDAsyncSocket cfstreamThread] (GCDAsyncSocket.m:6900)
7   Foundation                        0x0000000185a57138 __NSThread__start__ + 1000
8   libsystem_pthread.dylib           0x000000019a02fb3c _pthread_body + 156
9   libsystem_pthread.dylib           0x000000019a02faa0 _pthread_body + 0
10  libsystem_pthread.dylib           0x000000019a02d030 thread_start + 4

Thread 9 name:  AFNetworking
Thread 9:
0   libsystem_kernel.dylib            0x0000000199f4cc30 mach_msg_trap + 8
1   libsystem_kernel.dylib            0x0000000199f4caac mach_msg + 72
2   CoreFoundation                    0x0000000184ad0168 __CFRunLoopServiceMachPort + 196
3   CoreFoundation                    0x0000000184acde6c __CFRunLoopRun + 1032
4   CoreFoundation                    0x00000001849fcdc0 CFRunLoopRunSpecific + 384
5   Foundation                        0x00000001859707ec -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 308
6   Foundation                        0x00000001859c5e14 -[NSRunLoop(NSRunLoop) run] + 88
7   Chat                        0x0000000100340df4 +[AFURLConnectionOperation networkRequestThreadEntryPoint:] (AFURLConnectionOperation.m:169)
8   Foundation                        0x0000000185a57138 __NSThread__start__ + 1000
9   libsystem_pthread.dylib           0x000000019a02fb3c _pthread_body + 156
10  libsystem_pthread.dylib           0x000000019a02faa0 _pthread_body + 0
11  libsystem_pthread.dylib           0x000000019a02d030 thread_start + 4

Thread 10 name:  Dispatch queue: fmdb.
Thread 10:
0   CoreFoundation                    0x0000000184ae1f94 __CFStringAppendFormatCore + 1520
1   ???                               0x000000016e111268 0 + 6141579880
2   CoreFoundation                    0x0000000184ae196c _CFStringCreateWithFormatAndArgumentsAux2 + 244
3   Foundation                        0x0000000185965e10 -[NSPlaceholderString initWithFormat:locale:arguments:] + 168
4   Foundation                        0x0000000185965ce0 +[NSString stringWithFormat:] + 68
5   UIKit                             0x000000018a4511d0 ___UIImageCollectImagePathsForPath_block_invoke125 + 464
6   UIKit                             0x000000018a4515b4 ___UIImageCollectImagePathsForPath_block_invoke144 + 60
7   UIKit                             0x000000018a450934 ___UIImageCollectImagePathsForPath_block_invoke + 748
8   UIKit                             0x000000018a44fe34 _UIImageCollectImagePathsForPath + 816
9   UIKit                             0x000000018a0e8db4 _UIImageRefAtPath + 124
10  UIKit                             0x000000018a34ee90 -[UIImage(UIImagePrivate) initWithContentsOfFile:cache:] + 288
11  UIKit                             0x000000018a0e8d08 +[UIImage imageWithContentsOfFile:] + 72
12  Chat                        0x00000001004b30d8 -[EMChatImageInternal updateImage] (EMChatImageInternal.m:42)
13  Chat                        0x00000001004b3424 -[EMChatImageInternal setLocalPath:] (EMChatImageInternal.m:89)
14  Chat                        0x00000001004b8c28 -[EMChatImage setLocalPath:] (EMChatImage.m:52)
15  Chat                        0x00000001004d3624 +[EMMessage(Database) _createImageMessageBodyFromDict:] (EMMessage+Database.m:173)
16  Chat                        0x00000001004d457c +[EMMessage(Database) createMessageBodysFromDicts:] (EMMessage+Database.m:338)
17  Chat                        0x00000001005eb44c -[DXDBManager messageFromResultSet:] (DXDBManager.m:1347)
18  Chat                        0x00000001005ecb94 __78-[DXDBManager fetchMessagesForChatter:fromTimestamp:forLimit:forLoginAccount:]_block_invoke (DXDBManager.m:1558)
19  Chat                        0x00000001005857a0 __32-[EMFMDatabaseQueue inDatabase:]_block_invoke (EMFMDatabaseQueue.m:152)
20  libdispatch.dylib                 0x000000010169dd30 0x10169c000 + 7472
21  libdispatch.dylib                 0x00000001016a988c 0x10169c000 + 55436
22  Chat                        0x000000010058570c -[EMFMDatabaseQueue inDatabase:] (EMFMDatabaseQueue.m:166)
23  Chat                        0x00000001005ec980 -[DXDBManager fetchMessagesForChatter:fromTimestamp:forLimit:forLoginAccount:] (DXDBManager.m:1564)
24  Chat                        0x00000001004ad7a4 -[EMConversationInternal loadMessagesBefore:limit:] (EMConversationInternal.m:589)
25  Chat                        0x00000001003b7000 __38-[ChatViewController loadMoreMessages]_block_invoke (ChatViewController.m:1562)
26  libdispatch.dylib                 0x000000010169dd70 0x10169c000 + 7536
27  libdispatch.dylib                 0x000000010169dd30 0x10169c000 + 7472
28  libdispatch.dylib                 0x00000001016aa7f0 0x10169c000 + 59376
29  libdispatch.dylib                 0x00000001016a1a20 0x10169c000 + 23072
30  libdispatch.dylib                 0x000000010169dd30 0x10169c000 + 7472
31  libdispatch.dylib                 0x00000001016acf38 0x10169c000 + 69432
32  libdispatch.dylib                 0x00000001016ac600 0x10169c000 + 67072
33  libsystem_pthread.dylib           0x000000019a02d478 _pthread_wqthread + 1092
34  libsystem_pthread.dylib           0x000000019a02d028 start_wqthread + 4