Hendon lost late on at Dulwich on Tuesday evening as the home side won courtesy of a 98th minute penalty.
After an even first half that ebbed and flowed, George Porter opened the scoring stabbing home after Luke Campbell saved his initial effort.
Kai Brosnan equalised five minutes before half-time before a soporiphic second period in which Dulwich pushed but failed to break down a well-drilled Hendon back line.
The winner came in the final minute of second half stoppage time, when Ethan Light was adjudged to have handled the ball from a corner. Luke Wanadio made no mistake from the spot to clinch the points in front of 1349 fans.