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How to solve this
[09-Oct-2018 12:43:18 Europe/Berlin] PHP Warning: A non-numeric value encountered in ../includes/classes/categories_ul_generator.php on line 58
line 58 is this code
$result = sprintf($this->parent_group_start_string, ($submenu==true) ? ' class="level'. ($level+1) . '"' : '' );
on printing $this->parent_group_start_string echos blank
In another server where php is 5.6 , doesn't generate the error
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