[Plugin: WP Page Numbers] Errors caused by variables not being initialized

I’m getting 3 errors from functions:

wp_page_numbers() – $pagingMiddleString not initialized
wp_page_numbers_left_side() – $pagingString not initialized
wp_page_numbers_nextpage() – $pagingString not initialized
wp_page_numbers_prevpage() – $pagingString not initialized

The error can be fixed by initializing these variables at the top of the function.

https://www.ads-software.com/extend/plugins/wp-page-numbers/