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I have discovered that there is an error in KoolReport for this functionality. In the class koolreport \ datagrid \ DataTables line 471 there is the following code:
if ($ dir! == "asc" || $ dir! == "desc") continue;
the correct way would be:
if ($ dir! == "asc" && $ dir! == "desc") continue;
The idea was that the error was corrected.
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