Date formula not working when passing through years

Hi, I have two columns 'start date' and 'target completion date', I want the target completion date to auto populate three months on from the start date and have used the following formula:

=DATE(YEAR([Start Date]@row), MONTH([Start Date]@row) + 3, DAY([Start Date]@row))

When the start date is after 30th September it shows #INVALID VALUE like it cannot register it needs to go to the next year.

Does anyone have any idea what I need to change to fix this error?


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