diff --git a/src/main/resources/sql/functions/opinion/find_citizen_opinions_by_target_id.sql b/src/main/resources/sql/functions/opinion/find_citizen_opinions_by_target_id.sql
index 4268690..ecf7ce0 100644
--- a/src/main/resources/sql/functions/opinion/find_citizen_opinions_by_target_id.sql
+++ b/src/main/resources/sql/functions/opinion/find_citizen_opinions_by_target_id.sql
@@ -24,6 +24,10 @@ begin
             ol.name
         limit 100
     ) as t;
+
+    if (resource is null) then
+        resource = '[]'::json;
+    end if;
 end;
 $$;