Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window android.app.Activity.getWindow()' on a null object reference

[sibelius]

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window android.app.Activity.getWindow()' on a null object reference
       at org.capslock.RNDeviceBrightness.RNDeviceBrightnessModule.getBrightnessLevel(RNDeviceBrightnessModule.java:47)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.facebook.react.bridge.JavaMethodWrapper.invoke(JavaMethodWrapper.java:374)
       at com.facebook.react.bridge.JavaModuleWrapper.invoke(JavaModuleWrapper.java:162)
       at com.facebook.react.bridge.queue.NativeRunnable.run(NativeRunnable.java)
       at android.os.Handler.handleCallback(Handler.java:751)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:31)
       at android.os.Looper.loop(Looper.java:154)
       at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(MessageQueueThreadImpl.java:194)
       at java.lang.Thread.run(Thread.java:761)