Wycombe keeper Archer was attacked by a fan in the closing stages of his side's 1-0 League Two win over Gillingham at the Priestfield Stadium.
The 19-year-old - who is on loan from Tottenham - was placing the ball prior to taking a goal kick when the supporter entered the field and leapt towards him.
The fan was quickly apprehended by a steward and led away.
"Some people give the rest of the Gillingham fans a bad name," Wycombe boss Gareth Ainsworth told Sky Sports 1.
"I don't want to comment too much, but everyone is okay in there."