Null Reference used for synchronization

[ariniastari]

This error has been come up on my development on android

implementation

      const mixpanel = new MixpanelInstance(REACT_APP_MIXPANEL_ID);
      mixpanel.initialize().then(() => {
        mixpanel.track(currentScreen);
      });

• "react-native-mixpanel": "^1.1.4", (tried to downgrade to "^1.1.4" still no luck)
• "react-native": "0.59.10"
• Android Build

[lucasgerard]

In my case this was caused by passing an undefined token to Mixpanel.sharedInstanceWithToken.

if you're using react-native-config: please check that you've followed this extra step, otherwise your Config values will be undefined.