WordPress (v4.7.3) : GeoMyWP (v2.7) no result issue when PolyLang (2.1.2) is actived : Fixed with this...

functions.php

function gmw_polylang_remove_query_var( $args ) {

	foreach( $args->query_vars['tax_query'] as $key => $value ) {

		if ( $value['taxonomy'] == 'language' ) {

			unset( $args->query_vars['tax_query'][$key] );
		}
	}

	remove_filter( 'parse_query', 'gmw_polylang_remove_query_var', 99 );

	return $args;
}


function gmw_remove_polylang_from_search_query( $args, $gmw ) {

	add_filter( 'parse_query', 'gmw_polylang_remove_query_var', 99 );

	return $args;

}
add_filter( 'gmw_pt_search_query_args', 'gmw_remove_polylang_from_search_query', 99, 2 );