diff --git a/src/RequestParameters/SearchParameter.php b/src/RequestParameters/SearchParameter.php
index f12f0c4..f8ec935 100644
--- a/src/RequestParameters/SearchParameter.php
+++ b/src/RequestParameters/SearchParameter.php
@@ -91,7 +91,7 @@ protected function makeQuery(Builder $builder, array $arguments, string $boolOpe
                 continue;
             }
 
-            if ($this->isRelationSearch($key)) {
+            if ($this->isRelationSearch($key) && !str_contains($key, '!')) {
                 // relation search
                 [$rel, $attr] = explode(self::RELATION_SEPARATOR, $key, 2);