Hi,
I was able to reproduce the issue on my end.
It seems to come from an update that was done to the Google Visualization chart API.
Version 50 has been rolled out on 1st of April and has been made current yesterday:
groups.google.com/g/google-visualization-api/c/G4Keck3KVwU
So the charts automatically switched to that new version yesterday.
Change the line:
google.load("visualization", "1", {packages:["corechart","geochart"]});
to:
google.load("visualization", "49", {packages:["corechart","geochart"]});
in the file administrator/components/com_hikashop/classes/statistics.php in order to roll back to the previous version and it should fix the problem.