diff --git a/libs/client/package.json b/libs/client/package.json
index 4c50a30..e919801 100644
--- a/libs/client/package.json
+++ b/libs/client/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@fal-ai/serverless-client",
   "description": "The fal serverless JS/TS client",
-  "version": "0.6.0",
+  "version": "0.6.1",
   "license": "MIT",
   "repository": {
     "type": "git",
diff --git a/libs/client/src/realtime.ts b/libs/client/src/realtime.ts
index fd19d3d..f0ecf5f 100644
--- a/libs/client/src/realtime.ts
+++ b/libs/client/src/realtime.ts
@@ -120,6 +120,7 @@ const WebSocketErrorCodes = {
 const connectionManager = (() => {
   const connections = new Map<string, WebSocket>();
   const tokens = new Map<string, string>();
+  const isAuthInProgress = new Map<string, true>();
 
   return {
     token(app: string) {
@@ -150,10 +151,23 @@ const connectionManager = (() => {
     remove(connectionKey: string) {
       connections.delete(connectionKey);
     },
+    isAuthInProgress(app: string) {
+      return isAuthInProgress.has(app);
+    },
+    setAuthInProgress(app: string, inProgress: boolean) {
+      if (inProgress) {
+        isAuthInProgress.set(app, true);
+      } else {
+        isAuthInProgress.delete(app);
+      }
+    },
   };
 })();
 
 async function getConnection(app: string, key: string): Promise<WebSocket> {
+  if (connectionManager.isAuthInProgress(app)) {
+    throw new Error('Authentication in progress');
+  }
   const url = buildRealtimeUrl(app);
 
   if (connectionManager.has(key)) {
@@ -161,7 +175,9 @@ async function getConnection(app: string, key: string): Promise<WebSocket> {
   }
   let token = connectionManager.token(app);
   if (!token) {
+    connectionManager.setAuthInProgress(app, true);
     token = await connectionManager.refreshToken(app);
+    connectionManager.setAuthInProgress(app, false);
   }
   const ws = new WebSocket(`${url}?fal_jwt_token=${token}`);
   connectionManager.set(key, ws);
@@ -203,7 +219,7 @@ export const realtimeImpl: RealtimeClient = {
       return NoOpConnection;
     }
 
-    const enqueueMessages: Input[] = [];
+    let pendingMessage: Input | undefined = undefined;
 
     let reconnecting = false;
     let ws: WebSocket | null = null;
@@ -217,7 +233,7 @@ export const realtimeImpl: RealtimeClient = {
           })
         );
       } else {
-        enqueueMessages.push(input);
+        pendingMessage = input;
         if (!reconnecting) {
           reconnecting = true;
           reconnect();
@@ -231,14 +247,17 @@ export const realtimeImpl: RealtimeClient = {
       if (ws && ws.readyState === WebSocket.OPEN) {
         return;
       }
+      if (connectionManager.isAuthInProgress(app)) {
+        return;
+      }
       getConnection(app, connectionKey)
         .then((connection) => {
           ws = connection;
           ws.onopen = () => {
             reconnecting = false;
-            if (enqueueMessages.length > 0) {
-              enqueueMessages.forEach((input) => send(input));
-              enqueueMessages.length = 0;
+            if (pendingMessage) {
+              send(pendingMessage);
+              pendingMessage = undefined;
             }
           };
           ws.onclose = (event) => {