--- a/devtools/client/netmonitor/src/utils/request-utils.js
+++ b/devtools/client/netmonitor/src/utils/request-utils.js
@@ -168,17 +168,21 @@ function getUrlBaseName(url) {
 
 /**
  * Helpers for getting the query portion of a url.
  *
  * @param {string} url - url string
  * @return {string} unicode query of a url
  */
 function getUrlQuery(url) {
-  return (new URL(url)).search.replace(/^\?/, "");
+  try {
+     return (new URL(url)).search.replace(/^\?/, "");
+  } catch (err) {
+     return null;
+  }
 }
 
 /**
  * Helpers for getting unicode name and query portions of a url.
  *
  * @param {string} url - url string
  * @return {string} unicode basename and query portions of a url
  */