after posting my answer, I spent some more time on that I had no crashes under the iPhone simulator same app started as 'on my Mac', crashes after 3 or 4 new records Since I didn't had crashes when creating new records via sheet (2 empty TextFields and a button to create that record), I did the following: in my model, I initialized two fields with a string (before, I initalized the fields with empty strings ("")), "Title..." and "Author...". (title was the first field, clicking into that forced the crash) After this change, I created about 12 records, no crash! Hope that was the solution! Means that the empty string/attribute was the problem

same here. macOS 14.5, MacBook Pro M3 I can create some records (SwiftData) - and then, it crashes when I click into the first field of the new created record. Filling in one of the other TextFields seems to work, editing the record afterwards seems to work fine