Harry Brown conceded a careless penalty on the stroke of half time, which was duly converted by Graham Lewis.
The Robins were unable to get back on level terms and the match finished 1-0 at Larges Lane.
The Robins return to Hellenic Premier Division action against Abingdon Town on Saturday (3pm ko) and then travel to North Leigh United next Wednesday in the Hellenic Floodlit Cup second round.
Elsewhere, Ascot United were well beaten 3-0 by Flackwell Heath in the Berks & Bucks Senior Trophy, while Binfield lost 1-0 away to Fairford Town in the Floodlit Cup.
Sandhurst Town progressed to the next round of the Cherry Red Records Premier Challenge Cup thanks to a 3-1 win over Ash United at Bottom Meadow.
Eversley & California beat Fleet Spurs 3-1 after extra time in the Aldershot Senior Cup.
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