React
A valid React element or null must be returned
A valid React element (or null) must be returned.
React requires a component render method to return a valid React element or null, not undefined, an array, or another invalid value.
Error AtlasError Documentation and ResolutionObserved message
A valid React element (or null) must be returned.
Why it happens
- A render method returned undefined instead of JSX or null.
- A render method returned an array or another invalid object.
- Conditional render logic does not return a valid value on every path.
How to fix it
- Ensure the render method always returns a valid React element or null.
- Review conditional branches so every path returns an allowed value.
- Wrap multiple sibling elements in a single parent or fragment where appropriate.
Official reference
React Docs: Minified React error #109Related errors
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