XCode V12.2
Realm 10.1.4
RealmCore 10.1.3
Via SMP

I register sometimes this crash:

Date/Time: 2020-12-03 20:37:46.6433 +1000
Launch Time: 2020-12-03 14:35:25.3221 +1000
OS Version: iPhone OS 14.2 (18B92)
Release Type: User
Baseband Version: 6.02.01
Report Version: 104

Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x00000002d6c6ff35
VM Region Info: 0x2d6c6ff35 is not in any region. Bytes after previous region: 163638 Bytes before following region: 55452434635
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
mapped file 2d585c000-2d6c48000 [ 19.9M] r-/rw SM=S/A ...t_id=fb3ae6dd
---> GAP OF 0xce93b8000 BYTES
commpage (reserved) fc0000000-1000000000 [ 1.0G] --/-- SM=NUL ...(unallocated)

Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [3811]
Triggered by Thread: 0

0 xxxxxxx 0x00000001026092b0 *hidden#213_ + 0 (*hidden#171_:204)
1 xxxxxxx 0x00000001026092b0 hidden#113

• 0 (_hidden#171:205)
  2 xxxxxxx 0x0000000102609184 realm::Allocator::translate_less_critical(realm::Allocator::RefTranslation*, unsigned long) const + 76 (_hidden#147:143)
  3 xxxxxxx 0x000000010260f4e4 *hidden#526_ + 8 (*hidden#154_:568)
  4 xxxxxxx 0x000000010260f4e4 *hidden#525_ + 28 (*hidden#154_:576)
  5 xxxxxxx 0x000000010260f4e4 hidden#600 + 160 (_hidden#736:166)
  6 xxxxxxx 0x000000010269dd00 realm::Group::attach(unsigned long, bool, bool) + 88 (_hidden#4274:706)
  7 xxxxxxx 0x00000001026a3294 realm::Group::advance_transact(unsigned long, realm::impl::NoCopyInputStream&, bool) + 172 (hidden#4274:1675)
  8 xxxxxxx 0x0000000102501adc hidden#1853 + 432 (_hidden#1414:931)
  9 xxxxxxx 0x00000001025007a4 *hidden#2127_ + 12 (*hidden#1414_:573)
  10 xxxxxxx 0x00000001025007a4 realm::impl::transaction::cancel(realm::Transaction&, realm::BindingContext*) + 724 (hidden#1945:542)
  11 xxxxxxx 0x00000001025e8484 hidden#11044 + 20 (_hidden#11192:671)
  12 xxxxxxx 0x00000001025e8704 hidden#11048 + 52 (_hidden#11192:749)
  13 libobjc.A.dylib 0x00000001b38f1574 AutoreleasePoolPage::releaseUntil(objc_object**) + 200 (NSObject.mm:944)
  14 libobjc.A.dylib 0x00000001b38f1450 objc_autoreleasePoolPop + 208 (NSObject.mm:1211)
  15 CoreFoundation 0x000000019ff2d3b8 _CFAutoreleasePoolPop + 28 (NSObject.m:798)
  16 CoreFoundation 0x000000019fea08a0 __CFRunLoopPerCalloutARPEnd + 44 (CFRunLoop.c:762)
  17 CoreFoundation 0x000000019fe9babc __CFRunLoopRun + 2548 (CFRunLoop.c:3120)
  18 CoreFoundation 0x000000019fe9ab90 CFRunLoopRunSpecific + 572 (CFRunLoop.c:3242)
  19 GraphicsServices 0x00000001b61bd598 GSEventRunModal + 160 (GSEvent.c:2259)
  20 UIKitCore 0x00000001a2784638 -[UIApplication _run] + 1052 (UIApplication.m:3266)
  21 UIKitCore 0x00000001a2789bb8 UIApplicationMain + 164 (UIApplication.m:4738)
  22 Nextcloud 0x000000010218ff38 main + 88 (main.m:29)
  23 libdyld.dylib 0x000000019fb79588 start + 4