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Pull Request for Issue #21216 .
Summary of Changes
In ./libraries/src/HTML/HTMLHelper.php at line 610 it writes:
if (!is_array($attribs))
but should better be
if (!is_array($attribs) || !is_array($options))
Reason
An old extension adding stylesheets the (very) old way like
JHTML::stylesheet('filename','path-to-file');
will obviously not add the stylesheet but still create several "illegal string offset" notices instead of better eventually add a deprecated message to flog
(this is a recreation of a pr from @FoTo50 which went wrong