Gus Poyet refused to blame goalkeeper Tomasz Kuszczak after the goalkeeper’s error meant Albion had to settle for a 2-2 draw at Birmingham.
The Pole fumbled Nikola Zigic’s header over the line in the second minute of stoppage time to deny Albion a victory they deserved.
However, not for the first time this season, they were left cursing not being able to see out victory.
Poyet said: “It has happened to us too many times. Sometimes you have to give credit to the opposition, sometimes it is because of your own mistakes. I am used to it, so I am no more or less disappointed than normal.
“I didn't say anything to Tomasz. We accept mistakes. Everybody makes mistakes in football. It's about not making any more, nothing else.
“We didn't start well. We were not in the mentality of making a difference, just waiting for things to happen. The best thing that happened to us was the goal.
“As soon as we conceded we started playing more aggressive and trying to go forward. After that I thought it was a matter of time for us to score two or three or whatever.
“In the second half it was about trying to score another one. We didn't and as soon as Zigic and Marlon King went on you knew there would be 150,000 balls in the box.
“I think Tomasz only had to make one save, so I didn't see it (equaliser) coming at all.”