Specified Cast is not Valid When Doing Sum Formula

[megamorphg]

Describe the bug
There is an issue when I do a simple formula calculation like this and I get "Cast is not valid error" when doing sum(C2:C6)

To Reproduce
Steps to reproduce the behavior:

1. Create table as above
2. Create formula on 3rd column as shown.

Expected behavior
Sum formula should work with simple numbers. Would be even better if can do a column formula like sum(C:C) so can keep adding rows without changing the formula

Screenshots
Sum formula does not work with simple numbers

Environment (if applicable):

• OneNote Version: O365
• OneMore Version 5.1

Additional context

[stevencohn]

Temporary workaround until this is released - enter zero in the empty cells. Not great, I know, but will get you going.