diff --git a/src/Repository/RelationBuilder.php b/src/Repository/RelationBuilder.php
index 07f6c76..48f6f98 100644
--- a/src/Repository/RelationBuilder.php
+++ b/src/Repository/RelationBuilder.php
@@ -111,7 +111,7 @@ class RelationBuilder
 
                     $value = call_user_func([ $this->repository, $relation->function() ]) ?? null;
 
-                    if ($value === null && $this->resolver->reflectedClass->getProperties(true)[$name]->allowsNull()) {
+                    if ($value === null && $this->fieldIsNullable($name) ) {
                         return null;
                     }
 
@@ -203,7 +203,7 @@ class RelationBuilder
         throw new \InvalidArgumentException("Unknown or no relation was provided as relation type.");
     }
 
-    protected function fetchFromDataset($name, ? array $data = null) : object|bool
+    protected function fetchFromDataset($name, ? array $data = null) : object|bool|null
     {
         $attribute = $this->resolver->searchFieldAnnotation($name, [ Join::class ]) ?:
             $this->resolver->searchFieldAnnotation($name, [ Relation::class ]);
@@ -221,10 +221,7 @@ class RelationBuilder
                 $entity = $attribute->entity ?? $this->resolver->reflectedClass->getProperties()[$name]->getTypes()[0]->type;
             }
 
-            $name = strtolower($name);
-
             foreach($data ?: $this->entity->entityLoadedDataset as $key => $value) {
-
                 if ( $key === sprintf(static::SUBQUERY_FIELD_SUFFIX, strtolower($name)) ) {
                     if ($value) {
                         if ( null === ( $dataset = \json_decode($value, true) ) ) {
@@ -250,7 +247,7 @@ class RelationBuilder
                     return ( new $entity() )->fromArray($data)->resetVirtualProperties();
                 }
                 else {
-                    return new $entity();
+                    return $this->fieldIsNullable($name) ? null : new $entity();
                 }
             }
         }
@@ -343,4 +340,9 @@ class RelationBuilder
 
         return [];
     }
+    
+    protected function fieldIsNullable(string $name) : bool
+    {
+        return $this->resolver->reflectedClass->getProperties(true)[$name]->allowsNull();
+    }
 }
\ No newline at end of file