diff --git a/web_src/js/utils/testhelper.ts b/web_src/js/utils/testhelper.ts
index e91cf85e864bc..ed3c1e51e0b4d 100644
--- a/web_src/js/utils/testhelper.ts
+++ b/web_src/js/utils/testhelper.ts
@@ -2,5 +2,5 @@
 // even if backend is in testing mode, frontend could be complied in production mode
 // so this function only checks if the frontend is in unit testing mode (usually from *.test.ts files)
 export function isInFrontendUnitTest() {
-  return process.env.TEST === 'true';
+  return process && process.env.TEST === 'true';
 }