diff --git a/js/core/src/reflection.ts b/js/core/src/reflection.ts
index a63959bf13..5d9dbe8aee 100644
--- a/js/core/src/reflection.ts
+++ b/js/core/src/reflection.ts
@@ -263,7 +263,7 @@ export class ReflectionServer {
               response.write(JSON.stringify(chunk) + '\n');
             };
             const result = await action.run(input, {
-              context,
+              context: context || {},
               onChunk: callback,
               telemetryLabels,
               onTraceStart: onTraceStartCallback,
@@ -304,7 +304,7 @@ export class ReflectionServer {
         } else {
           // Non-streaming: send JSON response
           const result = await action.run(input, {
-            context,
+            context: context || {},
             telemetryLabels,
             onTraceStart: onTraceStartCallback,
             abortSignal: abortController.signal,