added check for undefined

lib/plugins/pagexray/index.js

@@ -81,6 +81,8 @@ export default class PageXrayPlugin extends SitespeedioPlugin {
             includeAssets: true,
             firstParty: this.options.firstParty ?? undefined
           };
+          if (!message.data) break;
+          if (!config) break;
           const pageSummary = pagexray.convert(message.data, config);
           if (!pageSummary) break;