diff --git a/src/Common/RichText.php b/src/Common/RichText.php
index d7ab5536..ba98963a 100644
--- a/src/Common/RichText.php
+++ b/src/Common/RichText.php
@@ -177,7 +177,7 @@ public function changeHref(string $href): self
             $href,
             $this->annotations,
             $this->type,
-            $this->text->changeUrl($href),
+            $this->text?->changeUrl($href),
             $this->mention,
             $this->equation,
         );