Cannot read property 'length' of undefined

[vscodeerrors]

Issue Id: 707eb795-3e1f-373e-3550-26946c65875f

Versions
- 1.37.1
Stack
TypeError: Cannot read property 'length' of undefined
/vs/workbench/contrib/debug/browser/repl.ts#772:64 (getHeight)
/vs/base/browser/ui/tree/abstractTree.ts#172:23 (getHeight)
/vs/base/browser/ui/tree/abstractTree.ts#172:23 (getHeight)
/vs/base/browser/ui/list/listView.ts#302:30
at Array.map ()
/vs/base/browser/ui/list/listView.ts#298:28 (_splice)
/vs/base/browser/ui/list/listView.ts#278:15 (splice)
/vs/base/browser/ui/list/splice.ts#17:34
at Array.forEach ()
/vs/base/browser/ui/list/splice.ts#17:19 (splice)
/vs/base/browser/ui/list/listWidget.ts#1275:56 (fn)
/vs/base/common/event.ts#792:12 (bufferEvents)
/vs/base/browser/ui/list/listWidget.ts#1275:21 (splice)
/vs/base/browser/ui/tree/abstractTree.ts#1094:8 (splice)
/vs/base/browser/ui/tree/indexTreeModel.ts#161:13
/vs/base/browser/ui/scrollbar/scrollbarState.ts#133:28

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• TypeError: Cannot read property 'length' of undefined (#79169)
• TypeError: Cannot read property 'match' of undefined (#76767)
• TypeError: Cannot read property 'templateData' of null (#79170)