Add a guard to prevent errors in onCLS

GoogleChrome · Sep 27, 2024 · e1c2d75 · e1c2d75
1 parent 87d8406
commit e1c2d75
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/src/onCLS.ts b/src/onCLS.ts
@@ -75,8 +75,9 @@ export const onCLS = (
             // session.
             if (
               sessionValue &&
-              // `lastSessionEntry` will be defined if `sessionsValue` is.
-              entry.startTime - lastSessionEntry!.startTime < 1000 &&
+              firstSessionEntry &&
+              lastSessionEntry &&
+              entry.startTime - lastSessionEntry.startTime < 1000 &&
               entry.startTime - firstSessionEntry.startTime < 5000
             ) {
               sessionValue += entry.value;