Fixed an issue on line 1255 of SalesLayer-Updater.php #5
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Fixed an issue in which, when $__group_multicategory is set to TRUE you receive the following error:
Warning: addslashes() expects parameter 1 to be string, array given in //sales-layer-api/src/SalesLayer-Updater.php on line 1255.
This fix implodes the given array back into a string to be used in the unedited line of code now on line 1259.