Illegal callback invocation from native module. This callback type only permits a single invocation from native code.

[jeremy8883]

How to replicate:
Call startActivity twice in a row, very quickly.

Error:

Illegal callback invocation from native module. This callback type only permits a single invocation from native code.
com.poberwong.launcher.IntentLauncherModule.onActivityResult (IntentLauncherModule.java:105)

The problem occurs because of this shared promise variable. If startActivity gets called a second time, before the onActivityResult callback, that promise value is replaced with the second one. Then this line gets called twice on that same second Promise object, and fails.