TypeError: Cannot read properties of null (reading 'findNode')

[nylzhy]

when I delay an opc ua server in node-red, I meet the problem, just like

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[error] TypeError: Cannot read properties of null (reading 'findNode')
at ServerEngine.refreshValues (C:\Users\Administrator.node-red\node_modules\node-opcua-server\source\server_engine.ts:1902:44)
at C:\Users\Administrator.node-red\node_modules\node-opcua-server\source\opcua_server.ts:2658:29
at OPCUAServer. (C:\Users\Administrator.node-red\node_modules\node-opcua-server\source\opcua_server.ts:2303:15)
at Generator.next ()
at C:\Users\Administrator.node-red\node_modules\node-opcua-server\dist\opcua_server.js:14:71
at new Promise ()
at __awaiter (C:\Users\Administrator.node-red\node_modules\node-opcua-server\dist\opcua_server.js:10:12)
at OPCUAServer._apply_on_SessionObject (C:\Users\Administrator.node-red\node_modules\node-opcua-server\dist\opcua_server.js:1428:16)
at OPCUAServer._on_ReadRequest (C:\Users\Administrator.node-red\node_modules\node-opcua-server\source\opcua_server.ts:2616:14)
at OPCUAServer.on_request (C:\Users\Administrator.node-red\node_modules\node-opcua-server\source\base_server.ts:381:25)

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Windows Version: WinServer 2022, 21H2, 20348.2461
Nodejs Version: 20.18.1
Node-red Version: 4.0.5

I do same operations in other machine wiith Windows 11(24H2 26100.2605), and have no problem

I hope your help, thanks