diff --git a/src/evalfunc.c b/src/evalfunc.c
index 16d9be3..8a06f75 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -9647,9 +9647,8 @@
 
     if (in_vim9script()
 	    && (check_for_number_arg(argvars, 0) == FAIL
-		|| (check_for_string_arg(argvars, 1) == FAIL
-		    || (argvars[1].v_type != VAR_UNKNOWN
-			&& check_for_opt_string_arg(argvars, 2) == FAIL))))
+		|| check_for_string_arg(argvars, 1) == FAIL
+		|| check_for_opt_string_arg(argvars, 2) == FAIL))
 	return;
 
     id = (int)tv_get_number(&argvars[0]);