diff --git a/mod.ts b/mod.ts
index 9563ced..be2f644 100644
--- a/mod.ts
+++ b/mod.ts
@@ -4,12 +4,10 @@ function startProcess(args: string[] = []): Deno.Process {
 
 const throttle = 500;
 let app: Deno.Process = startProcess(Deno.args);
-let appInitTime: number = Date.now();
 let timeout: number|null = null;
 
 function runApp() {
-  appInitTime = Date.now();
-  app.close();
+  app && app.close();
   app = startProcess(Deno.args);
 }