diff --git a/qjson.c b/qjson.c
index 491b61e..ca4fe7c 100644
--- a/qjson.c
+++ b/qjson.c
@@ -239,6 +239,9 @@ static void to_json(const QObject *obj, QString *str)
     }
     case QTYPE_NONE:
         break;
+    case QTYPE_QERROR:
+        fprintf(stderr, "qerror can't be emitted yet\n");
+        abort();
     }
 }