self.dbSemaphore.wait()
        autoreleasepool {
            var rlm: Realm? = nil
            do {
                rlm = try Realm(configuration: self.configuration)
                
                try rlm?.safeWrite {
                    rlm?.create(type, value: obj, update: .modified)
                }
                
                if frozenRealm {
                    self.freezeSemaphore.wait()
                    self.frozenRealm = rlm?.freeze()
                    self.freezeSemaphore.signal()
                }
            } catch {
                KNMapLogger.log.error("Failed to open or write to the Realm DB.")
            }
        }
        self.dbSemaphore.signal()

Crashed: NSOperationQueue 0x153d816f0 (QOS: UNSPECIFIED)
0  Realm                          0x2c2408 realm::Transaction::Transaction(std::__1::shared_ptr<realm::DB>, realm::SlabAlloc*, realm::DB::ReadLockInfo&, realm::DB::TransactStage) + 272
1  Realm                          0x198764 std::__1::shared_ptr<realm::Transaction> (anonymous namespace)::make_transaction_ref<std::__1::shared_ptr<realm::DB>, realm::SlabAlloc*, realm::DB::ReadLockInfo&, realm::DB::TransactStage>(std::__1::shared_ptr<realm::DB>&&, realm::SlabAlloc*&&, realm::DB::ReadLockInfo&, realm::DB::TransactStage&&) + 88
2  Realm                          0x19898c realm::DB::start_frozen(realm::VersionID) + 276
3  Realm                          0x4747ec realm::Realm::begin_read(realm::VersionID) + 52
4  Realm                          0x4746e4 realm::Realm::transaction() + 108
5  Realm                          0x12a0e4 -[RLMRealm frozenCopy] + 188
6  Realm                          0x12e2fc RLMGetFrozenRealmForSourceRealm(RLMRealm*) + 276
7  KNSDK                          0x2a8518 specialized closure #1 in KNMapGatewayRLM.insertData<A>(obj:type:primaryKey:frozenRealm:) + 16764
8  KNSDK                          0x2a81a0 specialized KNMapGatewayRLM.insertData<A>(obj:type:primaryKey:frozenRealm:) + 15876
9  KNSDK                          0x2a776c KNMapAttributeGatewayRLM.insertMapAttribute(arg:completion:) + 122 (KNMapAttributeGatewayRLM.swift:122)
10 KNSDK                          0x2a7e84 protocol witness for KNGatewayRLM.insertData(arg:completion:) in conformance KNMapAttributeGatewayRLM + 15080 (<compiler-generated>:15080)
11 KNSDK                          0x1acf78 closure #2 in closure #1 in KNMapLoaderRLM.retrieveDataRLMO(arg:completion:) + 16480
12 KNSDK                          0x1b752c partial apply for closure #2 in closure #1 in KNMapLoaderRLM.retrieveDataRLMO(arg:completion:) + 372 (<compiler-generated>:372)
13 KNSDK                          0x1aeb70 specialized closure #1 in KNLoader.downloadMapData(url:reqType:md5:retryCnt:completion:) + 23640
14 KNSDK                          0x1b83f4 partial apply for specialized closure #1 in KNLoader.downloadMapData(url:reqType:md5:retryCnt:completion:) + 4156 (<compiler-generated>:4156)
15 KNSDK                          0x1aef10 thunk for @escaping @callee_guaranteed (@guaranteed Data?, @guaranteed KNError?) -> () + 24568 (<compiler-generated>:24568)
16 KNSDK                          0x354fc __75-[KNHttpRequest requestWithHttpMethod:suspendOthers:urlSession:dateOrigin:]_block_invoke + 289 (KNHttpRequest.m:289)
17 Foundation                     0xa6f14 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 24
18 Foundation                     0x7b020 -[NSBlockOperation main] + 104
19 Foundation                     0x7afb0 __NSOPERATION_IS_INVOKING_MAIN__ + 16
20 Foundation                     0x3c4d8 -[NSOperation start] + 708
21 Foundation                     0x3c20c __NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 16
22 Foundation                     0x4189c __NSOQSchedule_f + 172
23 libdispatch.dylib              0x12fc4 _dispatch_block_async_invoke2 + 148
24 libdispatch.dylib              0x3eac _dispatch_client_callout + 20
25 libdispatch.dylib              0x7330 _dispatch_continuation_pop + 504
26 libdispatch.dylib              0x6998 _dispatch_async_redirect_invoke + 584
27 libdispatch.dylib              0x15944 _dispatch_root_queue_drain + 396
28 libdispatch.dylib              0x16158 _dispatch_worker_thread2 + 164
29 libsystem_pthread.dylib        0xda0 _pthread_wqthread + 228
30 libsystem_pthread.dylib        0xb7c start_wqthread + 8