diff --git a/src/components/tooltip/Marker.js b/src/components/tooltip/Marker.js
index acd35d5778..bf8f4a5850 100644
--- a/src/components/tooltip/Marker.js
+++ b/src/components/tooltip/Marker.js
@@ -414,7 +414,7 @@ class MarkerTooltipContents extends React.PureComponent<Props> {
     const { data, start } = marker;
     if (data && 'cause' in data && data.cause) {
       const { cause } = data;
-      const causeAge = start - cause.time;
+      const causeAge = cause.time !== undefined ? start - cause.time : 0;
       return [
         <TooltipDetailSeparator key="backtrace-separator" />,
         <TooltipDetail label="Stack" key="backtrace">
diff --git a/src/profile-logic/process-profile.js b/src/profile-logic/process-profile.js
index 238deb726f..3a57062606 100644
--- a/src/profile-logic/process-profile.js
+++ b/src/profile-logic/process-profile.js
@@ -1287,7 +1287,7 @@ export function adjustMarkerTimestamps(
       if (typeof newData.endTime === 'number') {
         newData.endTime += delta;
       }
-      if (newData.cause) {
+      if (newData.cause && newData.cause.time !== undefined) {
         newData.cause.time += delta;
       }
       if (newData.type === 'Network') {
diff --git a/src/profile-logic/processed-profile-versioning.js b/src/profile-logic/processed-profile-versioning.js
index bfc5f0c397..9caf9be846 100644
--- a/src/profile-logic/processed-profile-versioning.js
+++ b/src/profile-logic/processed-profile-versioning.js
@@ -1715,7 +1715,8 @@ const _upgraders = {
           data &&
           data.type !== 'tracing' &&
           data.type !== 'Styles' &&
-          data.cause
+          data.cause &&
+          data.cause.time !== undefined
         ) {
           data.cause.time += delta;
         }
diff --git a/src/types/markers.js b/src/types/markers.js
index 2d9ee679a7..bfe9c1b383 100644
--- a/src/types/markers.js
+++ b/src/types/markers.js
@@ -134,7 +134,7 @@ export type CauseBacktrace = {|
   // `tid` is optional because older processed profiles may not have it.
   // No upgrader was written for this change.
   tid?: Tid,
-  time: Milliseconds,
+  time?: Milliseconds,
   stack: IndexIntoStackTable,
 |};