CSOM: Unable to update or create content type - Value cannot be null. Parameter name: s

Question

When creating or updating content types using PnP/CSOM we are encountering the following error upon executing the query:

Microsoft.SharePoint.Client.ServerException: Value cannot be null. Parameter name: s

The routine had been working for months up until the past couple of days, and only seems to affect a few tenants, works fine for most others.

The content type in question is a relatively simple content type.

Has anyone else come up against this error? Or has any workaround?

Answer 1

This is a known issue because server side breaking changes at Microsoft's end.

Reference - Breaking change on creating content types using CSOM - Value cannot be null

Temporary fix - Update to the latest version of PnP CSOM/PnP PowerShell (3.9.1905.2) from Nuget and then apply the template again, it will fix the issue.