diff --git a/src/Simplex/Messaging/Agent.hs b/src/Simplex/Messaging/Agent.hs
index cb02facf9..9d523daeb 100644
--- a/src/Simplex/Messaging/Agent.hs
+++ b/src/Simplex/Messaging/Agent.hs
@@ -726,7 +726,7 @@ runCommandProcessing c@AgentClient {subQ} server = do
         DEL -> tryCommand $ deleteConnection' c connId >> notify OK
         _ -> notify $ ERR $ INTERNAL $ "unsupported async command " <> show (aCommandTag cmd)
       AInternalCommand cmd -> case server of
-        Just _srv -> case cmd of
+        Just _srv -> withConnLock c connId $ case cmd of
           ICAckDel _rId srvMsgId msgId -> tryCommand $ ack _rId srvMsgId >> withStore' c (\db -> deleteMsg db connId msgId)
           ICAck _rId srvMsgId -> tryCommand $ ack _rId srvMsgId
           ICAllowSecure _rId senderKey -> tryCommand $ do
diff --git a/src/Simplex/Messaging/Agent/Client.hs b/src/Simplex/Messaging/Agent/Client.hs
index 12279fa00..ca670d612 100644
--- a/src/Simplex/Messaging/Agent/Client.hs
+++ b/src/Simplex/Messaging/Agent/Client.hs
@@ -850,6 +850,7 @@ withStore c action = do
 storeError :: StoreError -> AgentErrorType
 storeError = \case
   SEConnNotFound -> CONN NOT_FOUND
+  SERatchetNotFound -> CONN NOT_FOUND
   SEConnDuplicate -> CONN DUPLICATE
   SEBadConnType CRcv -> CONN SIMPLEX
   SEBadConnType CSnd -> CONN SIMPLEX