diff --git a/services/nginx/app/traits/db_object_t.php b/services/nginx/app/traits/db_object_t.php
index 40a19b15..697b6ec7 100644
--- a/services/nginx/app/traits/db_object_t.php
+++ b/services/nginx/app/traits/db_object_t.php
@@ -487,7 +487,7 @@ trait db_object_t
                         continue;
                     }
                     // If the value is null, add a where clause to check if the field is null
-                    if ($value === null || (is_string($value) && strtolower($value) === 'null') || (is_string($value) && strtolower($value === 'is_null'))) {
+                    if ($value === null || (is_string($value) && strtolower($value) === 'null') || (is_string($value) && strtolower($value === 'is_null')) || is_string($value) && strtolower($value === 'is null')) {
                         $whereClauses[] = "$field IS NULL";
                         continue;
                     }