Getting "Version Conflict" on second update of list item

I am using javascript to update a list item in a SharePoint list.  It works great the first time, but the second time I get a "version conflict" error.  I don't want to have to reload my page.  Anyone have a suggestion?  Here is my javascript:

function SetDiscussionAddressed(discussionId, addressed) {
 var context = SP.ClientContext.get_current();
     var discussionList = context.get_web().get_lists().getByTitle("Discussion");
     var listItem = discussionList.getItemById(discussionId);
     listItem.set_item('Addressed', addressed);
     listItem.update();
     context.executeQueryAsync(SetDiscussionAddressed_Success, SetDiscussionAddressed_Failed);
}