Event - Repeating Date errors

After enabling the Repeating Date option (drop down or text field) for my Event Date Field any event I submit without a repeating date generates an error.

The Repeat option in my Event content type states "If nothing is selected, the date will not repeat." But the error appears to be upset that I'm supplying Null data. How can I fix this issue?

TIA
snack

* warning: date_timezone_set() expects parameter 1 to be DateTime, null given in /home/northbro/public_html/modules/date/date_api_ical.inc on line 568.
* warning: date_format() expects parameter 1 to be DateTime, null given in /home/northbro/public_html/modules/date/date_api_ical.inc on line 654.
* warning: date_timezone_set() expects parameter 1 to be DateTime, null given in /home/northbro/public_html/modules/date/date_api_ical.inc on line 568.
* warning: date_format() expects parameter 1 to be DateTime, null given in /home/northbro/public_html/modules/date/date_api_ical.inc on line 654.