The code on line 337 of /core/menu/megamenu.php needs to be changed from
$width += $colw; to $width = $colw; (remove the +).
This code is part of a if-statement that first of all tests for !$width. The error is thrown because in PHP7.1, it seems that you can no longer do mathematical operations (addition, in this case via the +=) on a null variable. The + should not have been used in the code at all because the if-statement already has established that $width is undefined or 0.
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The code on line 337 of /core/menu/megamenu.php needs to be changed from
$width += $colw;to$width = $colw;(remove the +).This code is part of a if-statement that first of all tests for
!$width. The error is thrown because in PHP7.1, it seems that you can no longer do mathematical operations (addition, in this case via the +=) on a null variable. The + should not have been used in the code at all because the if-statement already has established that $width is undefined or 0.Linked Conversation
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Conversation Subject: R: Problem with quix 5.2.2 on joomla 3
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