diff --git a/packages/route/lib/src/grammar.dart b/packages/route/lib/src/grammar.dart
index 951eb438..3f970ba7 100644
--- a/packages/route/lib/src/grammar.dart
+++ b/packages/route/lib/src/grammar.dart
@@ -192,7 +192,7 @@ class WildcardSegment extends RouteSegment {
       var items = r.value!.cast<RouteResult>();
       var a = items[0], b = items[1];
       return a
-        ..addAll(b.params ?? {})
+        ..addAll(b.params)
         .._setTail(b.tail);
     });
   }