diff --git a/tools/_setup_generation/step_viselements.py b/tools/_setup_generation/step_viselements.py
index 9160dd068..91ef3df81 100644
--- a/tools/_setup_generation/step_viselements.py
+++ b/tools/_setup_generation/step_viselements.py
@@ -249,7 +249,7 @@ def generate_element_doc(element_type: str, element_desc: Dict, prefix: str):
             ):
                 property_desc = property_descs[property_name]
                 name = property_desc[__class__.NAME]
-                doc = property_desc.get("doc", None)
+                doc = property_desc.get("doc", "")
                 if doc.startswith("UNDOCUMENTED"):
                     continue
                 type = property_desc["type"]