React native iOS app getting stuck at launch screen after importing firebase crashlytics?

I have implemented crashlytics in react native app which is working fine if i import just android or iOS folder separately but when i import crashlytics library in .js file iOS app is getting stuck at launch screen.

Please suggest the way or root cause fir this issue.

App is getting stuck after importing below library in js file else App is working fine

import crashlytics from '@react-native-firebase/crashlytics';

Error log

package.json as below

{
  "name": "abc",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "react-native start",
    "bundle-android": "react-native bundle --entry-file index.js --platform android --dev false --bundle-output ./android/app/src/main/assets/index.android.bundle --assets-dest ./android/app/src/main/res/",
    "bundle-ios": "react-native bundle --entry-file index.js --bundle-output ./ios/bundle/index.ios.jsbundle --platform ios --assets-dest ./ios/bundle --dev false",
    "test": "jest",
    "ios": "react-native run-ios --simulator 'iPhone X'",
    "android": "react-native run-android --variant=ProdDebug",
    "android-ete": "ENVFILE=.env.ete react-native run-android --variant=EteDebug",
    "ios-ete": "ENVFILE=.env.ete react-native run-ios",
    "ios-prod": "ENVFILE=.env.prod react-native run-ios",
    "exportcert-ete": "java -jar BKSPubKeyTool.jar --importkeystore keystore_ete.bks --alias oauth.testing --password keystorepwd --exportcert src/keystore/id_rsa_ete.pem --exportjs src/keystore/pubKey_ete.js",
    "exportcert-prod": "java -jar BKSPubKeyTool.jar --importkeystore keystore.bks --alias oauth --password keystorepwd --exportcert src/keystore/id_rsa_prod.pem --exportjs src/keystore/pubKey_prod.js",
    "lint": "eslint .",
    "clean": "react-native-clean-project"
  },
  "dependencies": {
    "@react-native-firebase/analytics": "^7.4.2",
    "@react-native-firebase/app": "^6.0.0-alpha.25",
    "@react-native-firebase/crashlytics": "^6.0.0-alpha.25",
    "axios": "^0.19.0",
    "buffer": "^5.2.1",
    "crypto-js": "^3.1.9-1",
    "jetifier": "^1.6.3",
    "jsencrypt": "^3.0.0-rc.1",
    "mobx": "^5.11.0",
    "mobx-react": "^5.4.4",
    "moment": "^2.24.0",
    "native-base": "^2.12.1",
    "prop-types": "^15.7.2",
    "querystring": "^0.2.0",
    "react": "16.8.6",
    "react-native": "0.60.3",
    "react-native-config": "^1.3.3",
    "react-native-date-picker": "^2.7.3",
    "react-native-device-info": "^2.2.2",
    "react-native-exception-handler": "^2.10.8",
    "react-native-gesture-handler": "^1.4.0",
    "react-native-keyboard-spacer": "^0.4.1",
    "react-native-linear-gradient": "^2.5.4",
    "react-native-modal": "^11.1.0",
    "react-native-modal-dropdown": "^0.6.2",
    "react-native-picker-select": "^6.3.0",
    "react-native-popup-dialog": "^0.18.2",
    "react-native-reanimated": "^1.4.0",
    "react-native-root-toast": "^3.1.2",
    "react-native-screens": "^2.0.0-beta.10",
    "react-native-scrollable-tab-view": "^0.10.0",
    "react-native-splash-screen": "^3.2.0",
    "react-native-sqlite-storage": "^3.3.11",
    "react-native-tab-view": "^2.8.0",
    "react-native-user-agent": "^1.0.4",
    "react-native-user-inactivity": "^1.0.1",
    "react-native-uuid": "^1.4.9",
    "react-native-wheel-picker-android": "^2.0.5",
    "react-navigation": "^3.11.1"
  },
  "devDependencies": {
    "@babel/core": "^7.5.5",
    "@babel/plugin-proposal-decorators": "^7.4.4",
    "@babel/runtime": "^7.5.5",
    "@react-native-community/eslint-config": "^0.0.5",
    "babel-jest": "^24.8.0",
    "babel-plugin-transform-decorators-legacy": "^1.3.5",
    "babel-preset-react-native": "^4.0.1",
    "eslint": "^6.1.0",
    "jest": "^24.8.0",
    "metro-react-native-babel-preset": "^0.55.0",
    "react-native-clean-project": "^3.4.0",
    "react-test-renderer": "16.8.6"
  },
  "jest": {
    "preset": "react-native"
  }
}