This is a reference entry from React error codes. A full explanation with fixes has not been written yet.
A valid React element (or null) must be returned. You may have returned undefined, an array or some other invalid object.
%s is filled in by React at runtime.
- Category
- Minified React error
- Severity
- error
- Runtime
- both
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Source: React error codes. Data fetched 2026-09-25T01:43:12.926Z.