Android: App crashes when getExternalFilesDir() returns null

[poison]

Hi,

I noticed that sometimes getExternalFilesDir() returns null, and then the app crashes.

Java exception in 'NativeModules' java.lang.NullPointerException: Attempt to invoke virtual method 'java.io.File java.io.File.getParentFile()' on a null object reference, stack: com.RNFetchBlob.RNFetchBlobFS.getSystemfolders@216 com.RNFetchBlob.RNFetchBlob.getConstants@84 com.facebook.react.bridge.JavaModuleWrapper.getConstants@140 android.os.Handler.handleCallback@751 android.os.Handler.dispatchMessage@95 com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage@31

I can reproduce it when I'm on Android 4.3 or below, but in production (we have an app with +/- 1 million installs) we hit this error on all kind of Android versions.

Best,
Nicolas

[poison]

A small update, the patch is rolled out to +/-5 % of our userbase (47k devices) and I didn't had the crash anymore. It would be great to see this one upstream so I don't need to point to my featurebranch on npm.

Best,
Nicolas