diff --git a/src/Repository.php b/src/Repository.php
index d5c3a72..937f424 100644
--- a/src/Repository.php
+++ b/src/Repository.php
@@ -425,7 +425,7 @@ class Repository implements RepositoryInterface
         }
 
         # @TODO Apply FILTER annotation to this too !
-        foreach(array_filter((array) $fields, fn($e) => ! isset($this->joined[$e])) as $item) {
+        foreach(array_filter((array) $fields, fn($e) => $e && ! isset($this->joined[$e]) ) as $item) {
             $this->joined[$item] = true;
 
             $attribute = $this->entityResolver->searchFieldAnnotation($item, [ Join::class  ]) ?:
@@ -480,7 +480,6 @@ class Repository implements RepositoryInterface
                 $this->close();
 
                 $key = is_string($attribute->key) ? $this->entityClass::field($attribute->key) : $attribute->key;
-
                 $foreignKey = $this->evalClosure($attribute->foreignKey, $entity, $alias);
 
                 $this->join($isRelation ? "LEFT" : $attribute->type, $entity::resolveEntity()->tableName(), $key, $foreignKey, $alias, function($join) use ($item, $entity, $alias, $options) {
@@ -647,7 +646,7 @@ class Repository implements RepositoryInterface
     }
 
     ## AWAITING THE Closures in constant expression from PHP 8.5 !
-    protected function evalClosure(string $content, string $entityClass, mixed $alias = self::DEFAULT_ALIAS) : mixed
+    protected function evalClosure(\Stringable|string $content, string $entityClass, mixed $alias = self::DEFAULT_ALIAS) : mixed
     {
         if (is_string($content)) {
             if ( str_starts_with($content, 'fn(') ) {