 <p>var worker=new Worker("js/uga_db_worker.js");</p> <pre><code> worker.postMessage(ugaName); worker.onmessage=function(event){ } }; </code></pre> <p>it my call in main.js</p> <p>i have find a fix, if in my worker i do not use a number version for opendatabase, all is working </p> <pre><code>db = openDatabase('kpisselencro', '', 'dashboard kpisselincro', 5 * 1024 * 1024); </code></pre> <p>the version number is empty, i don't know why , but it seem really fix it.</p>