diff --git a/radicale/app/report.py b/radicale/app/report.py
index da06b61d..f83e2d79 100644
--- a/radicale/app/report.py
+++ b/radicale/app/report.py
@@ -171,7 +171,9 @@ def xml_report(base_prefix: str, path: str, xml_request: Optional[ET.Element],
                        xmlutils.make_human_tag(root.tag), path)
         return client.FORBIDDEN, xmlutils.webdav_error("D:supported-report")
 
-    props: Union[ET.Element, List] = root.find(xmlutils.make_clark("D:prop")) or []
+    props: Union[ET.Element, List] = root.find(xmlutils.make_clark("D:prop"))
+    if props is None:
+        props: Union[ET.Element, List] = []
 
     hreferences: Iterable[str]
     if root.tag in (