diff --git a/pglab/QueryParamListController.cpp b/pglab/QueryParamListController.cpp
index 351bda9..4b5fb05 100644
--- a/pglab/QueryParamListController.cpp
+++ b/pglab/QueryParamListController.cpp
@@ -32,7 +32,8 @@ Pgsql::Params QueryParamListController::params() const
 			Oid oid = type->oid();
 			params.add(e.value, oid);
 		}
-		throw std::runtime_error("missing type in parameter list");
+		else
+			throw std::runtime_error("missing type in parameter list");
 	}
 	return params;
 }