diff --git a/apps/viewer/next.config.js b/apps/viewer/next.config.js
index 5518859ce..da8184747 100644
--- a/apps/viewer/next.config.js
+++ b/apps/viewer/next.config.js
@@ -76,40 +76,51 @@ const nextConfig = {
               }))
             )
         : []
-      ).concat([
-        {
-          source: '/api/typebots/:typebotId/blocks/:blockId/storage/upload-url',
-          destination:
-            '/api/v1/typebots/:typebotId/blocks/:blockId/storage/upload-url',
-        },
-        {
-          source:
-            '/api/typebots/:typebotId/blocks/:blockId/steps/:stepId/sampleResult',
-          destination: `${process.env.NEXTAUTH_URL}/api/v1/typebots/:typebotId/webhookBlocks/:blockId/getResultExample`,
-        },
-        {
-          source: '/api/typebots/:typebotId/blocks/:blockId/sampleResult',
-          destination: `${process.env.NEXTAUTH_URL}/api/v1/typebots/:typebotId/webhookBlocks/:blockId/getResultExample`,
-        },
-        {
-          source:
-            '/api/typebots/:typebotId/blocks/:blockId/steps/:stepId/unsubscribeWebhook',
-          destination: `${process.env.NEXTAUTH_URL}/api/v1/typebots/:typebotId/webhookBlocks/:blockId/unsubscribe`,
-        },
-        {
-          source: '/api/typebots/:typebotId/blocks/:blockId/unsubscribeWebhook',
-          destination: `${process.env.NEXTAUTH_URL}/api/v1/typebots/:typebotId/webhookBlocks/:blockId/unsubscribe`,
-        },
-        {
-          source:
-            '/api/typebots/:typebotId/blocks/:blockId/steps/:stepId/subscribeWebhook',
-          destination: `${process.env.NEXTAUTH_URL}/api/v1/typebots/:typebotId/webhookBlocks/:blockId/subscribe`,
-        },
-        {
-          source: '/api/typebots/:typebotId/blocks/:blockId/subscribeWebhook',
-          destination: `${process.env.NEXTAUTH_URL}/api/v1/typebots/:typebotId/webhookBlocks/:blockId/subscribe`,
-        },
-      ]),
+      )
+        .concat([
+          {
+            source:
+              '/api/typebots/:typebotId/blocks/:blockId/storage/upload-url',
+            destination:
+              '/api/v1/typebots/:typebotId/blocks/:blockId/storage/upload-url',
+          },
+        ])
+        .concat(
+          process.env.NEXTAUTH_URL
+            ? [
+                {
+                  source:
+                    '/api/typebots/:typebotId/blocks/:blockId/steps/:stepId/sampleResult',
+                  destination: `${process.env.NEXTAUTH_URL}/api/v1/typebots/:typebotId/webhookBlocks/:blockId/getResultExample`,
+                },
+                {
+                  source:
+                    '/api/typebots/:typebotId/blocks/:blockId/sampleResult',
+                  destination: `${process.env.NEXTAUTH_URL}/api/v1/typebots/:typebotId/webhookBlocks/:blockId/getResultExample`,
+                },
+                {
+                  source:
+                    '/api/typebots/:typebotId/blocks/:blockId/steps/:stepId/unsubscribeWebhook',
+                  destination: `${process.env.NEXTAUTH_URL}/api/v1/typebots/:typebotId/webhookBlocks/:blockId/unsubscribe`,
+                },
+                {
+                  source:
+                    '/api/typebots/:typebotId/blocks/:blockId/unsubscribeWebhook',
+                  destination: `${process.env.NEXTAUTH_URL}/api/v1/typebots/:typebotId/webhookBlocks/:blockId/unsubscribe`,
+                },
+                {
+                  source:
+                    '/api/typebots/:typebotId/blocks/:blockId/steps/:stepId/subscribeWebhook',
+                  destination: `${process.env.NEXTAUTH_URL}/api/v1/typebots/:typebotId/webhookBlocks/:blockId/subscribe`,
+                },
+                {
+                  source:
+                    '/api/typebots/:typebotId/blocks/:blockId/subscribeWebhook',
+                  destination: `${process.env.NEXTAUTH_URL}/api/v1/typebots/:typebotId/webhookBlocks/:blockId/subscribe`,
+                },
+              ]
+            : []
+        ),
     }
   },
 }