### What?
Fixes potential errors when passed to `sanitizeRelationships` `ref`
could potentially be a non object (for example `string`) because of
having in the database data in old structure.
```
"Cannot create property 'a' on string 'B'",
```
### Why?
Necessary particularly for the migration script, as it migrates
everything including versions that can have outdated data.
### How?
Ensures passed `ref` is an `object`.
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