Error:
Uncaught TypeError: Cannot convert undefined or null to object

http://1582761-master-survey-conditional-questi-59e3ba.runbot31.odoo.com/web/content/1621-5d4e269/1/survey.survey_assets.js:968
Traceback:
TypeError: Cannot convert undefined or null to object
    at Function.keys (<anonymous>)
    at Class._getInactiveConditionalQuestionIds (http://1582761-master-survey-conditional-questi-59e3ba.runbot31.odoo.com/web/content/1621-5d4e269/1/survey.survey_assets.js:968:1025)
    at Class._validateForm (http://1582761-master-survey-conditional-questi-59e3ba.runbot31.odoo.com/web/content/1621-5d4e269/1/survey.survey_assets.js:955:589)
    at Class._submitForm (http://1582761-master-survey-conditional-questi-59e3ba.runbot31.odoo.com/web/content/1621-5d4e269/1/survey.survey_assets.js:945:185)
    at Class._onKeyPress (http://1582761-master-survey-conditional-questi-59e3ba.runbot31.odoo.com/web/content/1621-5d4e269/1/survey.survey_assets.js:934:226)
    at HTMLDocument.dispatch (http://1582761-master-survey-conditional-questi-59e3ba.runbot31.odoo.com/web/content/1608-dc5adb9/1/web.assets_common_lazy.js:1594:447)
    at HTMLDocument.elemData.handle (http://1582761-master-survey-conditional-questi-59e3ba.runbot31.odoo.com/web/content/1608-dc5adb9/1/web.assets_common_lazy.js:1580:166)