Adam Cox, 27, failed to appear at City of London Magistrates Court for his hearing but was convicted in his absence of "throwing a missile on to a football playing area".
It was unclear whether the pie was aimed at a particular player or whether it struck anyone.
The court heard that Cox had served a three-year football banning order, applied in 2012, for a similar matter.
A warrant was issued for Cox, of Christchurch, Dorset, regarding the imposition of a new football banning order.
(Reporting by Martyn Herman, editing by Pritha Sarkar)
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