Error message: (Cannot read properties of undefined (reading "error")

**Describe the bug**
Sometimes we give the user an error message that says `Error message: (Cannot read properties of undefined (reading "error")`

Which basically means that our code somewhere tried to access an `errror` on something that is not there. This probably prevents that a useful error message is show.

I am not sure where exactly this happens and what code causes it.

Start by searching the TypeScript codebase for accesses to an error property and for the exact message text, then investigate which path can receive an undefined value. Reproduce the failure if possible and trace it to its source. Done means the original useful error is shown instead of the undefined-property message.

Written by the indexing model from the issue text.