diff --git a/kiri-engine/FileListen/HotReload.php b/kiri-engine/FileListen/HotReload.php
index 3505d144..2b2d4e2f 100644
--- a/kiri-engine/FileListen/HotReload.php
+++ b/kiri-engine/FileListen/HotReload.php
@@ -146,6 +146,7 @@ class HotReload extends Command
 		if ($pid && Process::kill($pid, 0)) {
 			Process::kill($pid) && Process::wait(true);
 		}
+		$this->process = null;
 		$this->process = $process;
 	}