Uninitialized string offset: 0 in ./libraries/joomla/application/web.php

[Quadratica]

I propose this simple fix.

web.php, Line 520

NOW

// We just need the prefix since we have a path relative to the root.
if ($url[0] == '/')
{
$url = $prefix . $url;
}

AFTER

// We just need the prefix since we have a path relative to the root.
if( isset($url[0]) && ($url[0] == '/') )
{
$url = $prefix . $url;
}