Guard against null value

Author: ockham

packages/blocks/src/store/utils.js

@@ -34,6 +34,7 @@ export function matchesAttributes( blockAttributes, variationAttributes ) {
 	return Object.entries( variationAttributes ).every( ( [ key, value ] ) => {
 		if (
 			typeof value === 'object' &&
+			value !== null &&
 			typeof blockAttributes[ key ] === 'object'
 		) {
 			return matchesAttributes( blockAttributes[ key ], value );