diff --git a/libs/core/looper.xtm b/libs/core/looper.xtm
index bb16667c8..bda0e6267 100644
--- a/libs/core/looper.xtm
+++ b/libs/core/looper.xtm
@@ -66,7 +66,7 @@
                  ;; duration
                  (let ((note-dur (* one_beat
                                    (+ 1 (length (take-while (lambda (x) (equal? x '|))
-                                                        (cl:nthcdr (cdr t) (car args))))))))
+                                                            (cl:nthcdr (min (cdr t) (length (car args))) (car args))))))))
                    (apply callback
                           (- (*metro* (+ beat (- (car t) pos))) *RMAP_HELPER_CALLBACK_OFFSET*)
                           func (+ beat (- (car t) pos)) note-dur