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The expected [Undefined object] undefined must be a string (IndexOutOfBounds)

I ran into an issue for sendkeys in Firefox, it throws the "Expected [Undefined object] undefined as string (IndexOutOfBounds)" exception.

I added the geckodriver path to the system variables to avoid posting the path in the code.

Firefox driver:

FirefoxProfile profile = new FirefoxProfile();
profile.SetPreference("browser.download.manager.alertOnEXEOpen", false);
profile.SetPreference("browser.helperApps.neverAsk.saveToDisk", "application/csv, text/csv, text/plain,application/octet-stream doc xls pdf txt");
profile.SetPreference("browser.download.manager.focusWhenStarting", false);
profile.SetPreference("browser.download.useDownloadDir", true);
profile.SetPreference("browser.helperApps.alwaysAsk.force", false);
profile.SetPreference("browser.download.manager.closeWhenDone", true);
profile.SetPreference("browser.download.manager.showAlertOnComplete", false);
profile.SetPreference("browser.download.manager.useWindow", false);
profile.SetPreference("services.sync.prefs.sync.browser.download.manager.showWhenStarting", false);
profile.SetPreference("pdfjs.disabled", true);
_driverInstance = new FirefoxDriver(profile);

StackTrace:

System.InvalidOperationException: Expected [object Undefined] undefined to be a string (IndexOutOfBounds)
Result StackTrace:  
at OpenQA.Selenium.Remote.RemoteWebDriver.UnpackAndThrowOnError(Response errorResponse)
at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters)
at OpenQA.Selenium.Remote.RemoteWebDriver.InternalExecute(String driverCommandToExecute, Dictionary`2 parameters)
at OpenQA.Selenium.Remote.RemoteWebElement.Execute(String commandToExecute, Dictionary`2 parameters)
at OpenQA.Selenium.Remote.RemoteWebElement.SendKeys(String text)
at LoginPage.set_forgotPwdEmail(String value)

Every test file that has SendKeys () throws this error.

I read a few questions on SO and found out that this is a Firefox issue. Is there any work around until it is fixed.

Firefox version: 53.0 GeckoDriver: geckodriver-v0.15.0-win64 Selinium version: 3.3.0

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3 answers


  • Selenium Upgrade to 3.4
  • Update GeckoDriver to version 16 or newer


If the problem persists, change the driver from 64 to 32 bit

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I used JavaScript to enter the value when Send Keys didn't work for me: ((IJavaScriptExecutor)). ExecuteScript ("arguments [0] .value = 'Test'", password);



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Try using System.Threading.Thread.Sleep (3000);

For example:

IWebElement Password = driver.FindElement(By.Id("txtPassword"));
 Password.SendKeys("pass");
 System.Threading.Thread.Sleep(3000);
 Password.SendKeys(Keys.Enter);
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