diff --git a/pkg/app/server.go b/pkg/app/server.go
index 6006ebf..f14cf0b 100644
--- a/pkg/app/server.go
+++ b/pkg/app/server.go
@@ -132,17 +132,17 @@ func (s *Server) Exec(ctx context.Context, callableOrFuncname any, args ...inter
 		value := result.value
 
 		if promise, ok := IsPromise(value); ok {
-			value = s.waitForPromise(promise)
+			return s.waitForPromise(promise), nil
 		}
 
 		return value.Export(), nil
 	}
 }
 
-func (s *Server) waitForPromise(promise *goja.Promise) goja.Value {
+func (s *Server) waitForPromise(promise *goja.Promise) any {
 	var (
 		wg    sync.WaitGroup
-		value goja.Value
+		value any
 	)
 
 	wg.Add(1)
@@ -162,7 +162,7 @@ func (s *Server) waitForPromise(promise *goja.Promise) goja.Value {
 					return
 				}
 
-				value = promise.Result()
+				value = promise.Result().Export()
 
 				breakLoop = true
 			})