diff --git a/a1/main b/a1/main
index 5bc851c..f534ddc 100755
Binary files a/a1/main and b/a1/main differ
diff --git a/a1/program.c b/a1/program.c
index bd9dc62..4cd5e11 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -44,11 +44,14 @@ void check_brackets(const char *line) {
                 return;
             }
         } else if (is_closing(ch)) {
-            if (stack_top >= 0 && stack[stack_top].bracket == matching_bracket(ch)) {
+            if (stack_top == -1) {
+                printf("Unexpected closing bracket %c in %d\n", ch, i);
+                return;
+            } else if (stack[stack_top].bracket == matching_bracket(ch)) {
                 stack_top--;
             } else {
                 printf("Crossed bracket %c in %d, expected %c\n", ch, i,
-                       stack_top >= 0 ? matching_bracket(stack[stack_top].bracket) : '#');
+                       matching_bracket(stack[stack_top].bracket));
                 return;
             }
         }