avoid TypeError on when registering service workers without config

Fixes #5299

avoid TypeError on when registering service workers without config
Fixes #5299
32c42858 · Peter Bengtsson · 3a4414c1 · 32c42858
Commit 32c42858 authored 6 years ago by Peter Bengtsson
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+1 -1
--- a/packages/react-scripts/template/src/serviceWorker.js
+++ b/packages/react-scripts/template/src/serviceWorker.js
@@ -78,7 +78,7 @@ function registerValidSW(swUrl, config) {
              console.log('Content is cached for offline use.');

              // Execute callback
-              if (config.onSuccess) {
+              if (config && config.onSuccess) {
                config.onSuccess(registration);
              }
            }