diff --git a/lib/api.dart b/lib/api.dart
index a91b188..5595117 100644
--- a/lib/api.dart
+++ b/lib/api.dart
@@ -255,7 +255,7 @@ class API {
         {"produced": produced?.map((x) => x.json()).toList()}));
 
     if (produced != null) {
-      return resp["produced"] as List<String>;
+      return (resp["produced"] as List<dynamic>).cast<String>();
     }
 
     return null;