arning: array_merge(): Argument #5 is not an array on widgets page in localhost

I have Shapley installed on multisite locally in xampp.
Widget areas are missing and the wie import failed as the areas were not registered.
only sidebar, homepage and 4 footer areas are showing.

Any ideas? Errors at the top of the widget page are pasted below.

Thanks

Warning: array_merge(): Argument #5 is not an array in C:\xampp\htdocs\Themehub\wp-includes\widgets.php on line 1159

Warning: array_diff(): Argument #2 is not an array in C:\xampp\htdocs\Themehub\wp-includes\widgets.php on line 1160

Warning: Invalid argument supplied for foreach() in C:\xampp\htdocs\Themehub\wp-includes\widgets.php on line 1162

Warning: array_merge(): Argument #1 is not an array in C:\xampp\htdocs\Themehub\wp-includes\widgets.php on line 1170

Hey there,

I hope you are well today and thank you for your question.

It’s hard to troubleshoot this issues on a local host.
Can you verify this issue exists on your hosting server?

This issue hasn’t been reported in live environments.

Best regards,
Support.