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Folkestone stay top of Ryman League, Division 1 South despite being held to a goalless draw at lowly Chipstead.
Invicta went into the game on the back of five straight league wins but they lost their main attacking outlet with half an hour of the game gone as Jimmy Dryden went off injured.
The hosts missed a great chance to open the scoring, when they were awarded a penalty after keeper Jack Delo fouled Ray Freeman in the box, but Gareth Graham failed to convert.
In the second half Josh Burchell struck the bar for Folkestone and in the closing stages Michael Yianni had a close range effort saved.