Server crashes when processing MKCOL requests with If header

[eight04]

C:\Users\eight04\dev\node-test\node_modules\webdav-server\lib\server\v2\RequestContext.js:248
            resource = fs.resource(this, path);
                          ^

TypeError: Cannot read property 'resource' of null
    at HTTPRequestContext.checkIfHeader (C:\Users\eight04\dev\node-test\node_modules\webdav-server\lib\server\v2\RequestContext.js:248:27)
    at C:\Users\eight04\dev\node-test\node_modules\webdav-server\lib\server\v2\commands\Mkcol.js:11:17
    at HTTPRequestContext.noBodyExpected (C:\Users\eight04\dev\node-test\node_modules\webdav-server\lib\server\v2\RequestContext.js:234:13)
    at default_1.unchunked (C:\Users\eight04\dev\node-test\node_modules\webdav-server\lib\server\v2\commands\Mkcol.js:10:13)
    at C:\Users\eight04\dev\node-test\node_modules\webdav-server\lib\server\v2\webDAVServer\StartStop.js:28:28
    at processTicksAndRejections (node:internal/process/task_queues:76:11)

STR:

1. Lock a folder.
2. Create a sub-folder inside the locked folder.