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@JoomKontenter
Yes you can do helper override.in helper override you can find the helper file of my map location in template.
there at line 2629 there is a function public static function getUrlLink($item)
at the end you can see com_mymaplocations which is sending to url link
replace the code there with
$url="javascript::void(0)";
if there is any issue please create a ticket support.