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/*
* This "might" help you (it was my issue)
* Try looking in this file: wp-includes/class-wp-query.php (around line 718)
* for a line that looks like this:
*/
if ( ! is_scalar( $qv['p'] ) || $qv['p'] < 0 ) {
/*
* And replace it with this line:
*/
if ( ! is_scalar( $qv['p'] ) || (int) $qv['p'] < 0 ) {
/*
* I hope that this helps!
*/