same before config.onUpdate

d600d8c3 · Peter Bengtsson · 32c42858 · d600d8c3
Unverified Commit d600d8c3 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
@@ -68,7 +68,7 @@ function registerValidSW(swUrl, config) {
              console.log('New content is available; please refresh.');
              // Execute callback
-              if (config.onUpdate) {
+              if (config && config.onUpdate) {
                config.onUpdate(registration);
              }
            } else {