WebdriverAgent error on using driver.keys() on iOS device

Question

I am writing automation test for mobile using Appium + WebdriverIO I need to enter a value from the keyboard using driver.keys()

On Android device it works . On iOS device I have got next error:

An unknown server-side error occurred while processing the command. Original error: Error Domain=com.facebook.WebDriverAgent Code=1 "Key Down action '1' must have a closing Key Up successor in '{
    type = keyDown;
    value = 1;
}'" UserInfo={NSLocalizedDescription=Key Down action '1' must have a closing Key Up successor in '{
    type = keyDown;
    value = 1;

I was searching for a possible fix in Google but did not find it. Please, help with it.