diff --git a/lib/tasks/transcribe.js b/lib/tasks/transcribe.js
index 1c5a991c..0e13fd7d 100644
--- a/lib/tasks/transcribe.js
+++ b/lib/tasks/transcribe.js
@@ -912,7 +912,7 @@ class TaskTranscribe extends SttTask {
       isHandledByPrimaryProvider = this.isHandledByPrimaryProviderForEp2;
     }
 
-    const isOneOfEndpointAlreadyFallenBack =
+    const isOneOfEndpointAlreadyFallenBack = !!this.ep && !!this.ep2 &&
       this.isHandledByPrimaryProviderForEp1 !== this.isHandledByPrimaryProviderForEp2;
 
     // fallback is configured
@@ -921,7 +921,7 @@ class TaskTranscribe extends SttTask {
       isHandledByPrimaryProvider &&
       // in global level, is there any fallback is already happened
       // one fallen endpoint will mark cs.hasFallbackAsr to true,
-      // so the other endpoint will be able to fallback again
+      // so if one endpoint  the other endpoint will be able to fallback again
       (isOneOfEndpointAlreadyFallenBack || !this.cs.hasFallbackAsr);
   }