Check the Troubleshooting guide about white screen.
There are two locations with Troubleshooting help
https://docs.storelocatorplus.com/blog/category/troubleshooting/
https://wp.storelocatorplus.com/documentation/store-locator-plus/troubleshooting/
We like to help our premier customers as quickly as possible but , cannot help with 0ut some info from you as shown in Posting guidelines, i.e your plugin environment and a site url that you have WPSLP on . For instance, versions, version of WP, PHP version.
Seen under Troubleshooting
White Screen
PHP coding errors or incompatibility between the code and specific PHP version running on your server.
Please let me know so I can close ticket if you do not require further assistance