throwOnImmutableMutation being hit when trying to send a message

[poffdeluxe]

Happening on iOS. Running react-native 0.42.3 and react-native-sentry 0.8.3

My index.os.js looks like this:

import { AppRegistry } from 'react-native';
import App from './App';

import {
  Sentry,
  SentrySeverity,
  SentryLog
} from 'react-native-sentry';

Sentry.config("[MY DSN HERE]", {
  // deactivateStacktraceMerging: true,
  logLevel: SentryLog.Debug
}).install();

AppRegistry.registerComponent('governedapp', () => App);

In my code, I'm attempting to send a message with:

      Sentry.captureMessage("My message", {
        level: SentrySeverity.Error
      });

but I'm getting this crash:

(I blurred out the key value since I think it's specific to the firebase integration I'm running)

It looks like this is happening when trying to prepare a list of breadcrumbs to send with my message. Seems like a non-release build specific error as well.

[poffdeluxe]

Was able to workaround this by turning off xhr breadcrumbs:

Sentry.config("[DSN]", {
  logLevel: SentryLog.Debug,
  autoBreadcrumbs: {
    'xhr': false,
    'console': true,
    'dom': true,
    'location': true 
  }
}).install();

[HazAT]

Fixed in v0.12.10