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Bull, 30, reached the milestone by helping Wanderers earn a vital point in their battle against relegation from League One with a 2-2 draw against Oldham.
"It's some achievement. He's played through injury to get to that figure too," Waddock told the club's official website.
"His performances during his time at the club have been nothing short of magnificent. He's a big character and we're delighted he's part of our group."
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