Realm crashes often after adding Firebase

I use Realm to cache data. It was behaving normally before but when I use Firebase to monitor app performance, Realm crashes often.

Crashed: com.apple.main-thread EXC_BAD_ACCESS KERN_INVALID_ADDRESS

0   libobjc.A.dylib class_getSuperclass + 4
1   ChopeDashboard  RLMUtil.hpp line 72 RLMIsObjectSubclass + 72
2   ChopeDashboard  RLMSchema.mm line 105 RLMRegisterClassLocalNames(objc_class**, unsigned long) + 105
3   ChopeDashboard  memory line 2942 +[RLMSchema sharedSchema] + 2942
4   ChopeDashboard  RLMRealm.mm line 492 +[RLMRealm realmWithConfiguration:error:] + 492
5   ChopeDashboard  RLMRealm.mm line 190 +[RLMRealm defaultRealm] + 190
6   ChopeDashboard  RLMObject.mm line 141 +[RLMObject objectsWithPredicate:] + 141

I found the same issue in github/Realm. Someone said they faced the same problem about Firebase/performance. But the issue is still open.