diff --git a/lib/galaxy/webapps/galaxy/api/__init__.py b/lib/galaxy/webapps/galaxy/api/__init__.py
index 9bcd7894e92a..45733a06954f 100644
--- a/lib/galaxy/webapps/galaxy/api/__init__.py
+++ b/lib/galaxy/webapps/galaxy/api/__init__.py
@@ -198,7 +198,9 @@ def base(self) -> str:
 
     @property
     def host(self) -> str:
-        return str(self.__request.client.host)
+        client = self.__request.client
+        assert client is not None
+        return str(client.host)
 
 
 class GalaxyASGIResponse(GalaxyAbstractResponse):