diff --git a/ts/smartpdf.classes.smartpdf.ts b/ts/smartpdf.classes.smartpdf.ts
index 967b74e..1310979 100644
--- a/ts/smartpdf.classes.smartpdf.ts
+++ b/ts/smartpdf.classes.smartpdf.ts
@@ -48,7 +48,11 @@ export class SmartPdf {
     this.htmlServerInstance.close(() => {
       done.resolve();
     });
-    await this.headlessBrowser.close();
+    
+    if (!this.externalBrowser) {
+      await this.headlessBrowser.close();
+    }
+
     await done.promise;
   }