React Hook “useEffect” is called conditionally

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Your code, after an if statement that contains return, is equivalent to an else branch:

if(!firebase.getCurrentUsername()) {
    ...
    return null
} else {
    useEffect(...)
    ...
}

Which means that it’s executed conditionally (only when the return is NOT executed).

To fix:

useEffect(() => {
  if(firebase.getCurrentUsername()) {
    firebase.getCurrentUserQuote().then(setQuote)
  }
}, [firebase.getCurrentUsername(), firebase.getCurrentUserQuote()])

if(!firebase.getCurrentUsername()) {
  ...
  return null
}

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