App is crashing on startup

--------- beginning of crash
2020-11-26 19:25:25.607 2251-2344/? E/AndroidRuntime: FATAL EXCEPTION: mqt_native_modules
Process: com.xxx.xxx, PID: 2251
com.facebook.react.common.JavascriptException: TypeError: null is not an object (evaluating ‘n.IsAndroid’), stack:
@831:84
v@2:1473
@434:422
v@2:1473
at com.facebook.react.modules.core.ExceptionsManagerModule.reportException(ExceptionsManagerModule.java:12)
at java.lang.reflect.Method.invoke(Native Method)
at com.facebook.react.bridge.JavaMethodWrapper.invoke(JavaMethodWrapper.java:18)
at com.facebook.react.bridge.JavaModuleWrapper.invoke(JavaModuleWrapper.java:2)
at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:1)
at android.os.Looper.loop(Looper.java:228)
at com.facebook.react.bridge.queue.MessageQueueThreadImpl$4.run(MessageQueueThreadImpl.java:8)
at java.lang.Thread.run(Thread.java:919)