diff --git a/src/attributecode/attrib.py b/src/attributecode/attrib.py
index b22c6d93..f19f0035 100644
--- a/src/attributecode/attrib.py
+++ b/src/attributecode/attrib.py
@@ -329,7 +329,7 @@ def generate_and_save(abouts, is_about_input, license_dict, output_location, sca
     )
 
     if rendering_error:
-        errors.append(rendering_error)
+        errors.extend(rendering_error)
 
     if rendered:
         output_location = add_unc(output_location)