diff --git a/docs/base.html b/docs/base.html
index 123bcaa..672218e 100644
--- a/docs/base.html
+++ b/docs/base.html
@@ -129,7 +129,11 @@ <h1 class="title">Module <code>keboola.component.base</code></h1>
                 if is_sync_action:
                     # sync action expects valid JSON in stdout on success.
                     result_str = process_sync_action_result(result)
-                    sys.stdout.write(result_str)
+                    # handle cases, when there is sync action called from another sync_action
+                    try:
+                        sys.stdout.write(result_str)
+                    except AttributeError:
+                        pass
 
                 return result
 
@@ -522,7 +526,11 @@ <h2 id="args">Args</h2>
                 if is_sync_action:
                     # sync action expects valid JSON in stdout on success.
                     result_str = process_sync_action_result(result)
-                    sys.stdout.write(result_str)
+                    # handle cases, when there is sync action called from another sync_action
+                    try:
+                        sys.stdout.write(result_str)
+                    except AttributeError:
+                        pass
 
                 return result
 
diff --git a/src/keboola/component/base.py b/src/keboola/component/base.py
index a05fda5..ec81257 100644
--- a/src/keboola/component/base.py
+++ b/src/keboola/component/base.py
@@ -101,7 +101,11 @@ def action_wrapper(self, *args, **kwargs):
                 if is_sync_action:
                     # sync action expects valid JSON in stdout on success.
                     result_str = process_sync_action_result(result)
-                    sys.stdout.write(result_str)
+                    # handle cases, when there is sync action called from another sync_action
+                    try:
+                        sys.stdout.write(result_str)
+                    except AttributeError:
+                        pass
 
                 return result