Error in book

Dear Mr. Korman, 

I just read the book Swindle (I  loved it) and in the book Hideout, on page 58, it says that Darren Vader has never climbed a tree. However, in Swindle, Darren climbed the tree to get the Babe Ruth card. Maybe you can check this out? 

I really like your books! 

Quinn (age 9)