From 9e748e5dc9b1bde7fcff60111c658f5b5e7e3976 Mon Sep 17 00:00:00 2001
From: Ralf Teusner <ralf.teusner@hpi.de>
Date: Mon, 19 Oct 2015 15:52:48 +0200
Subject: [PATCH] prevent nil access on containers not present any longer in
 delete...

---
 lib/docker_client.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/docker_client.rb b/lib/docker_client.rb
index 38c541d2..594d0bd2 100644
--- a/lib/docker_client.rb
+++ b/lib/docker_client.rb
@@ -126,7 +126,9 @@ class DockerClient
     container.stop.kill
     container.port_bindings.values.each { |port| PortPool.release(port) }
     clean_container_workspace(container)
-    container.delete(force: true, v: true)
+    if(container)
+      container.delete(force: true, v: true)
+    end
   end
 
   def execute_arbitrary_command(command, &block)