diff --git a/src/evalfunc.c b/src/evalfunc.c
index 8f52053..e4fa35b 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -2858,7 +2858,8 @@
     dict_T	*selfdict = NULL;
 
     if (in_vim9script()
-	    && (check_for_list_arg(argvars, 1) == FAIL
+	    && (check_for_string_or_func_arg(argvars, 0) == FAIL
+		|| check_for_list_arg(argvars, 1) == FAIL
 		|| check_for_opt_dict_arg(argvars, 2) == FAIL))
 	return;