Robinson, whose air-shot blunder condemned England to defeat against Croatia last year, gifted Germany striker Kevin Kuranyi a first-half equaliser as England slumped to a 2-1 defeat, their first at the new Wembley.
Robinson was substituted at half-time with Portsmouth's David James taking over the goalkeeping gloves but McClaren said: "I was disappointed with the way we conceded that goal. It may have been a mistake but there were two or three mistakes before that.
"I'm disappointed with the goals but this isn't a night to publicly state anything about the team in the future.
"I can't make any public comments about any of the 'keepers or any of the outfield players."
Frank Lampard, who had suffered abuse from England supporters in recent matches, gave England the lead after just nine minutes.
But once Kuranyi had cashed in on Robinson's mistake, England's defence again cracked to allow Christian Pander to score the winner for Germany with a 25-yard screamer.
McClaren said: "In the first 20 minutes, until we let them back in the game we were excellent overall. We created chances and on another night would have tucked them away."