Element Send Keys is not working with Firefox 55 & geckodriver 0.18.0

[zhengsy741]

System

• Version: 0.18.0
• Platform: MacOS 10.12.6
• Firefox: FF 55.0.2
• Selenium: selenium 3.5.0

Description

When using send_keys in geckodriver 0.18.0 , it throws error as "WebDriverException: Message: Expected [object Undefined] undefined to be a string"

While the problem is resolved if i change back to geckodriver 0.17.0.

Stacktrace

File "/lib/python/site-packages/selenium/webdriver/remote/webelement.py", line 350, in send_keys
'value': keys_to_typing(value)})
File "/lib/python/site-packages/selenium/webdriver/remote/webelement.py", line 499, in _execute
return self._parent.execute(command, params)
File "/lib/python/site-packages/selenium/webdriver/remote/webdriver.py", line 297, in execute
self.error_handler.check_response(response)
File "/lib/python/site-packages/selenium/webdriver/remote/errorhandler.py", line 194, in check_response
raise exception_class(message, screen, stacktrace)
WebDriverException: Message: Expected [object Undefined] undefined to be a string

Trace-level log

[andreastt]

Please provide a trace-level log, which you were asked for in the issue template but didn’t supply. It is very likely that your client is sending the wrong data format, so I’m tagging this as Selenium related.

[whimboo]

No response from reporter. Closing issue.

[lock]

This issue has been automatically locked since there has not been any recent activity after it was closed. If you have run into an issue you think is related, please open a new issue.