Failed to load resource

Failed to load resource

The Chrome javascript console gives the following error " Failed to load resource" when then user is triing instantly open two (remote loading) tabs. The first tab loading is interrupted, and the second is loaded completly. 
Is there any way to ensure loading of all tabs?

code of creating new tab: 
  1. function addTab(url, title) {
  2. var ct = $('#main_center');
  3. ct.tabs('add', url, title);
  4. ct.tabs('select',ct.tabs('length')-1);
  5. }