diff --git a/laravel/database/eloquent/relationships/belongs_to.php b/laravel/database/eloquent/relationships/belongs_to.php
index 485b7fcc..40463221 100644
--- a/laravel/database/eloquent/relationships/belongs_to.php
+++ b/laravel/database/eloquent/relationships/belongs_to.php
@@ -71,6 +71,8 @@ public function eagerly_constrain($results)
 			}
 		}
 
+		if (count($keys) == 0) $keys = array(0);
+
 		$this->table->where_in($this->model->key(), array_unique($keys));
 	}