1 files changed, 3 insertions, 0 deletions
diff --git a/stack.c b/stack.c
index 617e621..e1f0281 100644
--- a/stack.c
+++ b/stack.c
@@ -61,6 +61,9 @@ void stack_roll(stack *s) {
             s->start[i] = s->start[i+1];
         }
         s->start[i] = newtop;
+    } else {
+        // no item found
+        stack_push(s, 0);
     }
 }