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-rw-r--r--plus-inc.lisp1
1 files changed, 1 insertions, 0 deletions
diff --git a/plus-inc.lisp b/plus-inc.lisp
index cabc2d3..fd24a7d 100644
--- a/plus-inc.lisp
+++ b/plus-inc.lisp
@@ -5,6 +5,7 @@
 (defun cut-digits (number-list-reversed)
   "Given a reversed number list it cuts unecessay digits."
   (cond
+    ((null (cdr number-list-reversed)) number-list-reversed)
     ((eq (car number-list-reversed) '|0|)
      (cut-digits (cdr number-list-reversed)))
     (t number-list-reversed)))