diff --git a/src/elements/Tag.php b/src/elements/Tag.php
index b7c54f1..4e86e48 100644
--- a/src/elements/Tag.php
+++ b/src/elements/Tag.php
@@ -30,8 +30,8 @@ class Tag extends \craft\elements\Tag
 	// =========================================================================
 
 	/** @var Tag|null */
-	public ?Tag $replaceWith;
-	public ?int $usage;
+	public ?Tag $replaceWith = null;
+	public ?int $usage = null;
 
 	// Methods
 	// =========================================================================
@@ -204,4 +204,4 @@ protected static function defineSortOptions (): array
 		return $opts;
 	}
 
-}
\ No newline at end of file
+}