diff --git a/src/evalvars.c b/src/evalvars.c
index f73efd3..1f781da 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -4112,6 +4112,11 @@
     dictitem_T	*v;
     int		done = FALSE;
 
+    if (in_vim9script()
+	    && (check_for_buffer_arg(argvars, 0) == FAIL
+		|| check_for_string_arg(argvars, 1) == FAIL))
+	return;
+
     varname = tv_get_string_chk(&argvars[1]);
     buf = tv_get_buf_from_arg(&argvars[0]);
 
@@ -4251,6 +4256,12 @@
 
     if (check_secure())
 	return;
+
+    if (in_vim9script()
+	    && (check_for_buffer_arg(argvars, 0) == FAIL
+		|| check_for_string_arg(argvars, 1) == FAIL))
+	return;
+
     varname = tv_get_string_chk(&argvars[1]);
     buf = tv_get_buf_from_arg(&argvars[0]);
     varp = &argvars[2];