Or just use this Userscript (Greasemonkey, Tampermonkey, etc) I made a couple years ago and you'll never have to worry about anything, as it simply disables the whole paywall check in the first place.

// ==UserScript==
// @name        Economist No Limit
// @namespace   economist_no_limit
// @include     http*://*economist.com/*
// @version     1.0.0
// @grant       none
// @description 
// ==/UserScript==

/*
 * Debug Settings
 */
var debugLogEnabled = false;
var scriptShortName = "EconNoLim";

scriptLog = debugLogEnabled ? function(msg) { if(typeof msg === 'string'){ console.log(scriptShortName + ": " + msg); }else{ console.log(msg); } } : function() {};

/*
 * Helper function
 */
drupalOverride = function(context) {
    unsafeWindow.Drupal.settings.ec_wallpage.ec_wallpage_js_active = false
    originalDrupalOverride(context);
}
var originalDrupalOverride;

/*
 * Prepares the script
 */
function scriptInit()
{
    scriptLog("loaded");

    // Set up hooks
    try
    {
        originalDrupalOverride = unsafeWindow.Drupal.attachBehaviors;
        unsafeWindow.Drupal.attachBehaviors = drupalOverride;
    }
    catch(err) { logError(err); }
}

/*
 * Error handling
 * Can use 'error.stack', not cross-browser (though it should work on Firefox and Chrome)
 */
function logError(error)
{
    var stackMessage = "";
    if("stack" in error)
        stackMessage = "\n\tStack: " + error.stack;

    console.error(scriptShortName + " Error: " + error.name + "\n\tMessage: " + error.message + stackMessage);
}

/*
 * Start the script
 */
scriptInit();