NSMetadataQuery SEGV_ACCERR crashes at: _zapResultArrayIfIdenticalTo

Starting with iOS 9 I'm receiving a lot of crash reports for NSMetadataQuery crashing at _zapResultArrayIfIdenticalTo:

Exception Type: SIGSEGV
Exception Codes: SEGV_ACCERR at 0xc
Crashed Thread: 11


Application Specific Information:
bjc_msgSend() selector name: _zapResultArrayIfIdenticalTo:

Thread 11 Crashed:
0   libobjc.A.dylib                      0x34f4faf6 objc_msgSend + 22
1   Foundation                           0x2430c459 -[_NSMetadataQueryResultArray release] + 158
2   CoreFoundation                       0x2354bffd __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 10
3   CoreFoundation                       0x2354ba0b _CFXRegistrationPost + 396
4   CoreFoundation                       0x2354b7e1 ___CFXNotificationPost_block_invoke + 38
5   CoreFoundation                       0x2359fac3 -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1332
6   CoreFoundation                       0x234ad04b _CFXNotificationPost + 484
7   CoreFoundation                       0x2354bcf3 CFNotificationCenterPostNotificationWithOptions + 100
8   CloudDocs                            0x29a134c3 -[BRQuery _postNote:] + 100
9   Foundation                           0x24354a05 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 6
10  Foundation                           0x242b64af -[NSBlockOperation main] + 144
11  Foundation                           0x242a88bf -[__NSOperationInternal _start:] + 772
12  Foundation                           0x24356cc5 __NSOQSchedule_f + 190
13  libdispatch.dylib                    0x3564f04f _dispatch_queue_drain + 1760
14  libdispatch.dylib                    0x3564802f _dispatch_queue_invoke + 280
15  libdispatch.dylib                    0x356503dd _dispatch_root_queue_drain + 398
16  libdispatch.dylib                    0x3565024b _dispatch_worker_thread3 + 92
17  libsystem_pthread.dylib              0x357d9e29 _pthread_wqthread + 1022
18  libsystem_pthread.dylib              0x357d9a18 start_wqthread + 6

I process metadata query results on a dedicated queue and make sure to disable updates before accessing results. My code is similar to the ShapeEdit sample app.

After enabling the metadata query again, I still hold on to references to NSMetadataItem results to do further processing (loading thumbnails, updating a table view, etc.). Could this be the problem?

Most of the time, the crash seems to happen shortly after launching the app.