diff --git a/src/Highlighter/Prism.php b/src/Highlighter/Prism.php
index e3ff44b9..5a0040ee 100644
--- a/src/Highlighter/Prism.php
+++ b/src/Highlighter/Prism.php
@@ -52,6 +52,7 @@ public function stop(): void
         }
 
         $this->server->stop();
+        $this->server = null;
         $this->input->close();
     }