Cannot read properties of undefined (reading 'setChildren')

[VSCodeTriageBot]

TypeError: Cannot read properties of undefined (reading 'setChildren')
at ne.vc in src/vs/workbench/contrib/timeline/browser/timelinePane.ts:508:15
at ne.wc in src/vs/workbench/contrib/timeline/browser/timelinePane.ts:518:10
at ne.fc in src/vs/workbench/contrib/timeline/browser/timelinePane.ts:354:8
at ne.setUri in src/vs/workbench/contrib/timeline/browser/timelinePane.ts:343:8
at ne.<anonymous> in src/vs/workbench/contrib/timeline/browser/timelinePane.ts:298:61
at g.invoke in src/vs/base/common/event.ts:701:17
at n.deliver in src/vs/base/common/event.ts:908:22
at a.fire in src/vs/base/common/event.ts:869:24
at y.setUri in src/vs/workbench/contrib/timeline/common/timelineService.ts:132:24
at <anonymous> in src/vs/workbench/contrib/timeline/browser/timeline.contribution.ts:74:19
at fn in src/vs/platform/instantiation/common/instantiationService.ts:68:11
at v.k in src/vs/workbench/services/commands/common/commandService.ts:95:46
at v.executeCommand in src/vs/workbench/services/commands/common/commandService.ts:60:17
at fr.run in src/vs/platform/actions/common/actions.ts:472:31
at L.runAction in src/vs/base/common/actions.ts:192:16
at L.run in src/vs/base/common/actions.ts:183:15
at p.l in src/vs/workbench/services/contextmenu/electron-sandbox/contextmenuService.ts:251:33
at Object.click in src/vs/workbench/services/contextmenu/electron-sandbox/contextmenuService.ts:225:11
at EventEmitter.u in out/vs/workbench/workbench.desktop.main.js:553:36430
at Object.onceWrapper (node:events:646:26)
at EventEmitter.emit (node:events:526:28)
at Object.onMessage (node:<REDACTED: user-file-path>:81:803)

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