The Saddlers, buoyant after Saturday's 5-2 win over Hartlepool, went ahead through Matthew Richards in the 29th minute before Peter Leven restored parity from the penalty spot just after half-time.
But, despite having several chances, the Dons were unable to grab a winner, much to Robinson's dismay.
He said: "It was a frustrating evening for us all - fans, players and staff.
"But we're unbeaten in March. If you had said to me at the beginning of the month we would get those wins and one draw I would have jumped at it.
"I thought we did enough to win two games, we missed chance after chance after chance. I had my hands on my head for most of the game."