Fix crashes

SignalServiceKit/src/Loki/Protocol/Sync Messages/SyncMessagesProtocol.swift

@@ -177,11 +177,21 @@ public final class SyncMessagesProtocol : NSObject {
                 thread.save(with: transaction)
                 // This takes into account multi device
                 messageSender.send(autoGeneratedFRMessage, success: {
-                    autoGeneratedFRMessage.remove(with: transaction)
-                    thread.isForceHidden = false
+                    DispatchQueue.main.async {
+                        storage.dbReadWriteConnection.readWrite { transaction in
+                            autoGeneratedFRMessage.remove(with: transaction)
+                            thread.isForceHidden = false
+                            thread.save(with: transaction)
+                        }
+                    }
                 }, failure: { error in
-                    autoGeneratedFRMessage.remove(with: transaction)
-                    thread.isForceHidden = false
+                    DispatchQueue.main.async {
+                        storage.dbReadWriteConnection.readWrite { transaction in
+                            autoGeneratedFRMessage.remove(with: transaction)
+                            thread.isForceHidden = false
+                            thread.save(with: transaction)
+                        }
+                    }
                 })
             case .requestReceived:
                 thread.saveFriendRequestStatus(.friends, with: transaction)

SignalServiceKit/src/Messages/OWSFailedMessagesJob.m

@@ -50,6 +50,7 @@ static NSString *const OWSFailedMessagesJobMessageStateIndex = @"index_outoing_m
     [[transaction ext:OWSFailedMessagesJobMessageStateIndex]
         enumerateKeysMatchingQuery:query
                         usingBlock:^void(NSString *collection, NSString *key, BOOL *stop) {
+                            if (key == nil) { return; }
                             [messageIds addObject:key];
                         }];