diff --git a/src/Unparsers/Field.php b/src/Unparsers/Field.php
index c2cf83d..c112eef 100644
--- a/src/Unparsers/Field.php
+++ b/src/Unparsers/Field.php
@@ -250,7 +250,7 @@ private function unparse_field_block_editor(): self {
 		}
 
 		$lists  = \MBB\Helpers\AllowedBlockLists::get_lists();
-		$blocks = (array) $this->allowed_blocks;
+		$blocks = \MBB\Helpers\AllowedBlockLists::filter_valid_blocks( (array) $this->allowed_blocks );
 
 		// Check if a list with the same blocks already exists.
 		foreach ( $lists as $id => $list ) {