Are you having a WHMCS and got error like this?

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VerticalHorizontal
<script>
document.write('<script src="//sharebutton.net/plugin/sharebutton.php?type=vertical&u='+ encodeURIComponent(document.location.href) + '"></scr' + 'ipt>');
</script>
I found the responsible code in templates/default/homepage.tpl

Code:
<script>
document.write('<script src="//sharebutton.net/plugin/sharebutton.php?type=vertical&u=' + encodeURIComponent(document.location.href) + '"></scr' + 'ipt>');
</script>
Any idea how to fix it?