Using base64 image strings for an app in React Native crashes

I am using base64 strings as image sources. when i open my app crashes immediately when loading any image with font. and at the same time the application closes me. this happens only on IOS on Android everything works fine.

I am using react-native version: "0.62.2"

For example:

<ImageBackground source={{"uri": 'base64encodedstring'}} />