Cannot set property 'innerHTML' of undefined

// ==UserScript== 
// @name AlloY Script 
// @namespace LolzteaM 
// @AuTHoR AlloY 
// @include https://lolzteam.net/* 
// @require https://code.jquery.com/jquery-3.3.1.min.js 
// ==/UserScript== 
 
name = 'AlloY'; 
 
 
var script = document.createElement("script"); 
script.setAttribute("src", "//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"); 
script.addEventListener('load', function() { 
var script = document.createElement("script"); 
script.textContent = "window.jQ=jQuery.noConflict(true);(" + main.toString() + ")();"; 
document.body.appendChild(script); 
}, false); 
document.body.appendChild(script); 
 
 
function main() { 
var AlloY = document.createElement('div'); 
document.getElementsByClassName('blockLinksList')[0].appendChild(AlloY); 
 
$('.username').each(function(i) { 
if ($(this).children().eq(0).text() == name) { 
console.log(1); 
$(this).children().eq(0).attr('class', 'style228'); 
var d = $(this).closest('.messageUserBlock').children('div').eq(1); 
} 
}); 
 
var z=0; 
while (z<20) 
{ 
var SummDok1 = document.getElementsByClassName('team_banner45')[z], 
name1 = '<em class="userBanner Sanya330 wrapped" itemprop="title"><span class="before"></span><strong>S T A R</strong><span class="after"></span></em>'; 
SummDok1.innerHTML = name1; 
z++; 
} 
}