Implementing my own reverse

reverse1.clj

;; Exception in thread "main" java.lang.UnsupportedOperationException: Can only recur from tail position (test.clj:6)

(defn rev [data]
  (loop [data data, product ()]
    (if (empty? data)
      product
    ((conj product (first data))
      (recur (rest data) product)))))

(print (rev '(1 2 3 4 5)))

reverse2.clj

;; loops endlessly

(defn rev [data]
  (loop [data data, product ()]
    (if (empty? data)
      product
      (conj product (first data)))
    (recur (rest data) product)))

(print (rev '(1 2 3 4 5)))