TypeError: Converting circular structure to JSON

#2809

5.19.1
Description
Error:
TypeError: Converting circular structure to JSON
    --> starting at object with constructor 'b'
    |     property 'collections' -> object with constructor 'Object'
    |     property '149e8f85-8be3-4957-b38b-981c51e38da7' -> object with constructor 'Object'
  at JSON.stringify(<anonymous>)
  at eventToSentryRequest(../node_modules/@sentry/core/esm/request.js:6:20)
  at sendEvent(../node_modules/@sentry/browser/esm/transports/fetch.js:28:25)
  at sendEvent(../node_modules/@sentry/core/esm/basebackend.js:38:25)
  at call(../node_modules/@sentry/core/esm/baseclient.js:318:28)
  at _sendEvent(../node_modules/@sentry/browser/esm/client.js:45:37)
  at onfulfilled(../node_modules/@sentry/core/esm/baseclient.js:377:27)
  at onfulfilled(../node_modules/@sentry/utils/esm/syncpromise.js:136:33)
  at ? (../node_modules/@sentry/utils/esm/syncpromise.js:61:33)
  at Array.forEach(<anonymous>)
  at _executeHandlers(../node_modules/@sentry/utils/esm/syncpromise.js:55:28)
  at _attachHandler(../node_modules/@sentry/utils/esm/syncpromise.js:46:19)
  at executor(../node_modules/@sentry/utils/esm/syncpromise.js:126:19)
  at new e(../node_modules/@sentry/utils/esm/syncpromise.js:73:13)
  at then(../node_modules/@sentry/utils/esm/syncpromise.js:125:16)
  at executor(../node_modules/@sentry/core/esm/baseclient.js:348:18)
  at new e(../node_modules/@sentry/utils/esm/syncpromise.js:73:13)
  at _processEvent(../node_modules/@sentry/core/esm/baseclient.js:346:16)
  at apply(../node_modules/@sentry/core/esm/baseclient.js:91:14)
  at _invokeClient(../node_modules/@sentry/hub/esm/hub.js:58:39)
  at captureEvent(../node_modules/@sentry/hub/esm/hub.js:184:14)
  at handler(../node_modules/@sentry/browser/esm/integrations/globalhandlers.js:61:28)
  at triggerHandlers(../node_modules/@sentry/utils/esm/instrument.js:77:17)
  at Q.onerror(../node_modules/@sentry/utils/esm/instrument.js:434:9)
This is how we're reporting exceptions:
    // error: Error, severityLevel: Severity, extras: { [key: string]: any } 
    withScope(scope => {
      scope.setExtras(extras)
      scope.setLevel(severityLevel)
      captureException(error)
    })