Feature - Return a proper errors instead of a debug_asserts

1. Description

We have some debug_asserts in the codebase that turn out to be conditions that can be tripped in production. We should turn some of these into proper Errors. The one that we should definitely handle is the one here:

1.1 Context & Purpose

We think that one of the debug_asserts is a proper error so it should be treated as such. For the others, we should at least have a look to see if they should be removed or upgraded and act on them accordingly.

2. Technical Details:

Generally speaking, we create new error variants for the debug_assert condition that we want to convert (if an error variant does not exist for the condition already) and return them when the proper condition is triggered.

2.1 Acceptance Criteria:

• The debug assertion highlighted above is replaced with a proper error.

3. Related Issues and Pull Requests (optional):