diff --git a/kitty/parser.c b/kitty/parser.c
index fd0dadf6b..fd31f8653 100644
--- a/kitty/parser.c
+++ b/kitty/parser.c
@@ -1227,6 +1227,7 @@ END_ALLOW_CASE_RANGE
             break;
         case NUL:
         case DEL:
+            SET_STATE(0);
             break;  // no-op
         default:
             REPORT_ERROR("Invalid character in CSI: 0x%x, ignoring the sequence", ch);