Autotests didn't work which last version WebdriverIO: 4.9.10
After update WebdriverIO I can have error about function isVisible or waitForExist where used it for my selector:

SongLine_Auto_tests-Webdriver_Run_Auto_test_1450.log
Example error for test gallery image and movies add correct
Error: Promise was rejected with the following reason: selector needs to be typeof `string`
at Page.Object.create.waitVisible.value (tests/Pages/UploadPage.js:18:52)
at Context.<anonymous> (tests/tests/gallery.add.rename.delete.test.js:65:20)
at new Promise (node_modules/wdio-sync/node_modules/core-js/library/modules/es6.promise.js:171:7)
at elements() - isExisting.js:46:17
at isExisting() - waitForExist.js:67:22
UploadPage view:

Maybe it is duplicate https://github.com/webdriverio/webdriverio/issues/2481
@christian-bromann still have this error

yesterday all work well. Now didn't
@christian-bromann set "webdriverio": "4.9.9" - all work well

Most helpful comment
@christian-bromann set "webdriverio": "4.9.9" - all work well
