diff --git a/src/misc1.c b/src/misc1.c
index 554f10b..b6325dc 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -2351,6 +2351,11 @@
     if (check_restricted() || check_secure())
 	goto errret;
 
+    if (in_vim9script()
+	    && (check_for_string_arg(argvars, 0) == FAIL
+		|| check_for_opt_string_or_number_arg(argvars, 1) == FAIL))
+	return;
+
     if (argvars[1].v_type != VAR_UNKNOWN)
     {
 	/*