diff --git a/src/StyleManager/Styles.php b/src/StyleManager/Styles.php
index 5b924d0..8fcc5a5 100644
--- a/src/StyleManager/Styles.php
+++ b/src/StyleManager/Styles.php
@@ -86,6 +86,7 @@ public function prepare($identifier, $arrGroups=null): Styles
     {
         $this->currIdentifier = $identifier;
         $this->currGroups     = $arrGroups;
+        $this->exclGroups     = null;
 
         return $this;
     }