Fixed error in Windows when server is restarted then the run button is clicked in the output pane from a previous run.

node_modules/vfs-local/localfs.js

@@ -2094,7 +2094,7 @@ module.exports = function setup(fsOptions) {
         // Kill the session with the same name before starting a new one
         if (options.kill) {
             session = sessions[options.session];
-            if (session)
+            if (session && session.pty)
                 session.pty.kill();
             
             if (!options.command)