Fellow #Hive Devs,
I've updated the https://www.npmjs.com/package/@hiveio/keychain module to a new version, which adds the new method keychainRequestSign, a wrapper for requestSignBuffer.
Reason for this is, that the way the original keychain wrapper receives arguments, it doesn't know which argument is which. And setting an argument after callback, i.e. title, and thus the callback to null due to the argument being prior to title, breaks the function.