diff --git a/datasette/app.py b/datasette/app.py
index 40fc55be..2cf980e1 100644
--- a/datasette/app.py
+++ b/datasette/app.py
@@ -1090,8 +1090,6 @@ class Datasette:
             for candidate in candidates:
                 if candidate is None:
                     continue
-                if not isinstance(candidate, PermissionSQL):
-                    continue
                 plugin_blocks.append(candidate)
 
         sql, params = build_rules_union(
diff --git a/datasette/views/special.py b/datasette/views/special.py
index c0d3d453..b825c1c0 100644
--- a/datasette/views/special.py
+++ b/datasette/views/special.py
@@ -305,12 +305,6 @@ class AllowedResourcesView(BaseView):
             for candidate in candidates:
                 if candidate is None:
                     continue
-                if not isinstance(candidate, PermissionSQL):
-                    logger.warning(
-                        "Skipping permission_resources_sql result %r from plugin; expected PermissionSQL",
-                        candidate,
-                    )
-                    continue
                 plugins.append(candidate)
 
         rows = await resolve_permissions_from_catalog(