diff --git a/boot.c b/boot.c
index 03ecc60..16ccf14 100644
--- a/boot.c
+++ b/boot.c
@@ -39,12 +39,12 @@ int echo_size;
 
 int readchar() {
     int ch = getchar();
-    if (ch != '\n') {
-        echo_buffer[echo_size++] = ch;
-    } else {
+    if (ch == '\n' || ch == -1) {
         echo_buffer[echo_size++] = 0;
         printf("#@%s\n", echo_buffer);
         echo_size = 0;
+    } else {
+        echo_buffer[echo_size++] = ch;
     }
     return ch;
 }
diff --git a/demo/empty.c b/demo/empty.c
new file mode 100644
index 0000000..c272dab
--- /dev/null
+++ b/demo/empty.c
@@ -0,0 +1 @@
+int main() {}
\ No newline at end of file