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@wdio/local-runner: Failed launching test session: TypeError: Cannot read property 'toLowerCase' of undefined

See original GitHub issue

Describe the bug

We have our WebdriverIO(Mocha) project integrated with Azure Devops pipeline and also Browserstack as a cloud. When i run it locally with browserstack - everything works well, however when i run on Azure - for some reason i get this error

@wdio/local-runner: Failed launching test session: TypeError: Cannot read property 'toLowerCase' of undefined

Tests are still passing but for some reason it is failing pipeline due to this error. Also i do not even see any ‘toLowerCase’ in my code as well as node-modules to even debug it or figure out why it is happening.

Environment:

WebdriverIO version: 6.1.25
Node.js version: 13.10.1
NPM version: 6.14.5
Platform name and version: iOS cloud latest (browserstack)
Additional wdio packages used (if applicable):

    "@wdio/appium-service": "^6.1.16",
    "@wdio/cli": "^6.1.25",
    "@wdio/junit-reporter": "^6.1.25",
    "@wdio/local-runner": "^6.1.25",
    "@wdio/mocha-framework": "^6.1.19",
    "@wdio/selenium-standalone-service": "^6.1.14",
    "@wdio/sync": "^6.1.14",
    "webdriverio": "^6.1.25",
    "@wdio/spec-reporter": "^6.1.23",
    "appium": "^1.17.1",
    "browserstack-local": "^1.4.5",
    "chai": "^4.2.0"

Config of WebdriverIO

process.env.PLATFORM = "IOS"

exports.config = {
    runner: 'local',
    user: process.env.BROWSERSTACK_USERNAME || '*****',
    key: process.env.BROWSERSTACK_ACCESS_KEY || '**********',

    updateJob: false,
    specs: [
      './spec/tests/*_spec.js'
    ],
    exclude: [],

    framework: 'mocha',
      mochaOpts: {
        timeout: 99999999
    },

    logLevel: 'trace',

    reporters: [
        'spec',
        ['junit', {
            outputDir: './reportsIOS/',
            outputFileFormat: function(options) { // optional
                return 'test-ios.xml'
            }
        }]
    ],

    capabilities: [{
      'name': 'My company',
      'build': 'IOS',
      'project': 'UI tests',
      'device': 'iPhone 11 Pro',
      'app': "my_app_custom_id",
      'os_version': '13',
      'browserstack.debug': true,
      "browserstack.appium_version" : "1.17.0",
        }],
      }

[0-0] 2020-07-08T13:33:42.073Z ERROR @wdio/local-runner: Failed launching test session: TypeError: Cannot read property 'toLowerCase' of undefined
    at JunitReporter.buildJunitXml (/home/vsts/work/1/s/node_modules/@wdio/junit-reporter/build/index.js:152:122)
    at JunitReporter.onRunnerEnd (/home/vsts/work/1/s/node_modules/@wdio/junit-reporter/build/index.js:23:22)
    at JunitReporter.WDIOReporter.on.runner (/home/vsts/work/1/s/node_modules/@wdio/reporter/build/index.js:145:12)
    at JunitReporter.emit (events.js:198:13)
    at JunitReporter.EventEmitter.emit (domain.js:448:20)
    at reporters.forEach.reporter (/home/vsts/work/1/s/node_modules/@wdio/runner/build/reporter.js:38:49)
    at Array.forEach (<anonymous>)
    at BaseReporter.emit (/home/vsts/work/1/s/node_modules/@wdio/runner/build/reporter.js:38:20)
    at Runner.run (/home/vsts/work/1/s/node_modules/@wdio/runner/build/index.js:166:19)
    at process._tickCallback (internal/process/next_tick.js:68:7)
2020-07-08T13:33:42.078Z DEBUG @wdio/local-runner: Runner 0-0 finished with exit code 1
[0-0] FAILED in mycustomid - /spec/tests/login_spec.js
2020-07-08T13:33:42.079Z INFO @wdio/cli:launcher: Run onComplete hook