From 2962649dc82ef9a00b5a84655bce4e219c686822 Mon Sep 17 00:00:00 2001
From: Julien Duponchelle <julien@gns3.net>
Date: Wed, 19 Apr 2017 09:17:32 +0200
Subject: [PATCH] Fix a race condition when handling error at project opening

Fix #983
---
 gns3server/controller/project.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gns3server/controller/project.py b/gns3server/controller/project.py
index 6622145f..c71ce360 100644
--- a/gns3server/controller/project.py
+++ b/gns3server/controller/project.py
@@ -650,7 +650,7 @@ class Project:
             self.dump()
         # We catch all error to be able to rollback the .gns3 to the previous state
         except Exception as e:
-            for compute in self._project_created_on_compute:
+            for compute in list(self._project_created_on_compute):
                 try:
                     yield from compute.post("/projects/{}/close".format(self._id))
                 # We don't care if a compute is down at this step