There are very frequent crashes when I remove manually unwanted data. Unfortunately not reproducible when the problem occurs.
Process: Cookie [9046]
Path: /Applications/Cookie.app/Contents/MacOS/Cookie
Identifier: com.sweetpproductions.Cookie5
Version: 5.0.3 (5.0.7)
App Item ID: 1048338802
App External ID: 816334100
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Cookie [9046]
User ID: 501
Date/Time: 2016-04-09 11:03:45.044 +0200
OS Version: Mac OS X 10.11.4 (15E65)
Report Version: 11
Anonymous UUID: 2E22D1E8-C01C-8A75-8C0E-233A69A0D81F
Sleep/Wake UUID: D866A7D6-8335-4DFB-B617-B19EA04D2B76
Time Awake Since Boot: 290000 seconds
Time Since Wake: 9200 seconds
System Integrity Protection: enabled
Crashed Thread: 6 Dispatch queue: NSOperationQueue 0x7f9ab594a4c0 :: NSOperation 0x7f9ab590c030 (QOS: USER_INITIATED)
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Application Specific Information:
Performing @selector(buttonPressed:) from sender NSButton 0x7f9ab5b2e240
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'
abort() called
terminating with uncaught exception of type NSException
Application Specific Backtrace 1:
0 CoreFoundation 0x00007fff87b1e4f2 __exceptionPreprocess + 178
1 libobjc.A.dylib 0x00007fff9b23b73c objc_exception_throw + 48
2 CoreFoundation 0x00007fff87a34ae0 checkForCloseTag + 0
3 Cookie 0x0000000108572827 Cookie + 149543
4 Cookie 0x0000000108599a3f Cookie + 309823
5 Cookie 0x00000001085a4cd2 Cookie + 355538
6 Cookie 0x000000010858ead2 Cookie + 264914
7 Foundation 0x00007fff927507d7 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 7
8 Foundation 0x00007fff92750495 -[NSBlockOperation main] + 100
9 Foundation 0x00007fff9274eb7a -[__NSOperationInternal _start:] + 654
10 Foundation 0x00007fff9274ab64 __NSOQSchedule_f + 194
11 libdispatch.dylib 0x00007fff882d440b _dispatch_client_callout + 8
12 libdispatch.dylib 0x00007fff882d903b _dispatch_queue_drain + 754
13 libdispatch.dylib 0x00007fff882df707 _dispatch_queue_invoke + 549
14 libdispatch.dylib 0x00007fff882d7d53 _dispatch_root_queue_drain + 538
15 libdispatch.dylib 0x00007fff882d7b00 _dispatch_worker_thread3 + 91
16 libsystem_pthread.dylib 0x00007fff90bb74de _pthread_wqthread + 1129
17 libsystem_pthread.dylib 0x00007fff90bb5341 start_wqthread + 13