Er, that's Pickford's...we know he's had a few- i said others- research them and get your answer- you can even do Big Nev the year he was voted Footballer of the Year and find some clangers (i'll start you off- Spurs (h), Norwich (a), Ipswich (h)). If you're going to say Pickford was at fault vs Man Utd earlier this season, then Martyn did plenty of them (beaten at near post vs RS, fumbled weak shot into the path of striker vs Arsenal, etc).
Martyn didn't have as many shockers than Howard, who had so many poor performances at Everton, it got to the point where the fans would sarcastically clap him for catching a ball (harshly, in my view).