i think you have a misplaced bracket for the sockerr statement
Code:
on *:SOCKREAD:YTube: {
  if (!$sockerr) {
    var %sockreader | sockread %sockreader
    tokenize 32 %sockreader
  }
    if ($regex(%sockreader,/"length_seconds":".+?"/)) {
      echo -a $1
      unset %link
      sockclose YTube
  }
}

#imAbeginner
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