Ensure positions has length before referencing (#998)

2022-09-14 23:23:38 -04:00
parent 7be26b07eb
commit 49d143f777
1 changed files with 3 additions and 1 deletions
--- a/packages/rrweb/src/replay/timer.ts
+++ b/packages/rrweb/src/replay/timer.ts
@@ -101,7 +101,9 @@ export function addDelay(event: eventWithTime, baselineTime: number): number {
  // so we need to find the real timestamp by traverse the time offsets.
  if (
    event.type === EventType.IncrementalSnapshot &&
-    event.data.source === IncrementalSource.MouseMove
+    event.data.source === IncrementalSource.MouseMove &&
+    event.data.positions &&
+    event.data.positions.length
  ) {
    const firstOffset = event.data.positions[0].timeOffset;
    // timeOffset is a negative offset to event.timestamp