Issue with fetch, response.json()

Question

I am trying to make an api call using fetch method in react-native.

I have rn-fetch-blob for uploading images in one screen which is on another different screen. This particular function was for me to initiate a payment online using paystack. though the issue is not about the paystack because this worked in a new project without having rn-fetch-blob in it. Secondly if i remove response.json(), it wouldn't return anything but there wouldn't be any error. but with response.json(), if get this error attempt to invoke interface method 'java.lang.bridge.readablemap. getstring(java.lang.string)' on a null object reference.

I suspect there is a conflict between rn-fetch-blob and fetch because even without using rn-fetch-blob, it runs through perfectly, if i do

fetch('https://facebook.github.io/react-native/movies.json')
    .then((response) => response.json())
    .then((responseJson) => {
      return responseJson.movies;
    })
    .catch((error) => {
      console.error(error);
    })

same error comes

i expect a reference value like hyhjgbhgfh

attempt to invoke interface method 'java.lang.bridge.readablemap. getstring(java.lang.string)' on a null object reference.

I logged out response and i saw