Merge pull request #8998 from toddlahman/master

Fix for Invalid argument supplied for foreach

includes/class-wc-tax.php

@@ -239,11 +239,13 @@ class WC_Tax {
 		$rates          = self::find_rates( $args );
 		$shipping_rates = array();
 
+		if ( is_array( $rates ) ) {
 			foreach ( $rates as $key => $rate ) {
 				if ( 'yes' === $rate['shipping'] ) {
 					$shipping_rates[ $key ] = $rate;
 				}
 			}
+		}
 
 		return $shipping_rates;
 	}