Fix deadlock

Signal/src/ViewControllers/ConversationView/ConversationViewController.m

@@ -733,6 +733,12 @@ typedef enum : NSUInteger {
             [self.headerView updateSubtitleForCurrentStatus];
         });
     }
+
+    if ([self.thread isKindOfClass:TSContactThread.class]) {
+        [LKStorage writeWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
+            [SSKEnvironment.shared.profileManager ensureProfileCachedForContactWithID:self.thread.contactIdentifier with:transaction];
+        }];
+    }
 }
 
 - (void)createContents

SignalServiceKit/src/Loki/Protocol/Multi Device/MultiDeviceProtocol.swift

@@ -165,10 +165,11 @@ public final class MultiDeviceProtocol : NSObject {
         let recipient = SignalRecipient.getOrBuildUnsavedRecipient(forRecipientId: hexEncodedPublicKey, transaction: transaction)
         let udManager = SSKEnvironment.shared.udManager
         let senderCertificate = udManager.getSenderCertificate()
+        SSKEnvironment.shared.profileManager.ensureProfileCachedForContact(withID: hexEncodedPublicKey, with: transaction) // Prevent the line below from starting a write transaction
         let (promise, seal) = Promise<OWSMessageSend>.pending()
+        LokiAPI.workQueue.async {
             var recipientUDAccess: OWSUDAccess?
             if let senderCertificate = senderCertificate {
-            SSKEnvironment.shared.profileManager.ensureProfileCachedForContact(withID: hexEncodedPublicKey, with: transaction) // Prevent the line below from starting a write transaction
                 recipientUDAccess = udManager.udAccess(forRecipientId: hexEncodedPublicKey, requireSyncAccess: true)
             }
             let messageSend = OWSMessageSend(message: message, thread: thread, recipient: recipient, senderCertificate: senderCertificate,
@@ -178,6 +179,7 @@ public final class MultiDeviceProtocol : NSObject {
                 externalSeal?.reject(error)
             })
             seal.fulfill(messageSend)
+        }
         return promise
     }