diff --git a/manager.js b/manager.js
index f729ad0..a83b6ab 100644
--- a/manager.js
+++ b/manager.js
@@ -44,6 +44,9 @@ export const shutdown = function(){
           a.then(()=>{
             running--;
             mayShutdown();
+          }).catch(()=>{
+            running--;
+            mayShutdown();
           });
         }else{
           running--;