fix eslint issue

Author: toptobes

lib/promise-utils.js

@@ -145,11 +145,11 @@ function times(count, limit, fn) {
 
 /**
  * Deals with unexpected rejections in order to avoid the unhandled promise rejection warning or failure.
- * @param {Promise} promise
+ * @param {Promise | undefined} promise
  * @returns {undefined}
  */
 function toBackground(promise) {
-  promise?.catch(() => {});
+  promise && promise.catch(() => {});
 }
 
 /**