Update from 8.8.2 to 8.8.3 causes "Uncaught TypeError: Invalid path. Must be either string or array"

[christian-schwaderer]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Mongoose version

8.8.3

Node.js version

20.18.0

MongoDB server version

7

Typescript version (if applicable)

No response

Description

I tried upgrading Mongoose from 8.8.2 to 8.8.3. But when trying to create a document I got this issue:

Uncaught TypeError: Invalid `path`. Must be either string or array
      at Object.exports.get (node_modules/mpath/lib/index.js:59:11)
      at Object.exports.getValue (Role node_modules/mongoose/lib/utils.js:624:16)
      at model.Document.$__getValue (Role node_modules/mongoose/lib/document.js:1771:16)
      at getSubdocs (Role node_modules/mongoose/lib/document.js:3695:23)
      at model.Document.$getAllSubdocs (Role node_modules/mongoose/lib/document.js:3723:3)
      at _getPathsToValidate (Role node_modules/mongoose/lib/document.js:2714:25)
      at model.Document.$__validate (Role node_modules/mongoose/lib/document.js:2980:25)
      at node_modules/kareem/index.js:497:25
      at processTicksAndRejections (node:internal/process/task_queues:77:11)

Tried to look a little bit and it seems that the problematic line is for (const { path } of doc.$__schema.childSchemas) {
It seems my schema has a paths property but not a path property and hence an undefined value is passed down. But that's where my knowledge ends. Cannot say how come.

Steps to Reproduce

Sorry but I cannot paste hundreds of lines of company code in here. I have no idea where in my schema the problem is.

Expected Behavior

No response

[hansgen]

We're experiencing the same issue.

[maximilianschmid]

Same here

[vkarpov15]

Without a repro script there's no way for us to guarantee a fix, but in #15098 we added some logic to improve this error message and a potential (but unlikely) fix. Can anyone in this thread please provide a script that demonstrates this issue or some sample code that can give us some hints?