diff --git a/sao/src/view/form.js b/sao/src/view/form.js
index d69fd05f2a..ea2b2bdd26 100644
--- a/sao/src/view/form.js
+++ b/sao/src/view/form.js
@@ -4774,7 +4774,8 @@ function eval_pyson(value){
             var record = this.record;
             var field = this.field;
             this.update_selection(record, field, () => {
-                this.select.prop('size', this.select.children().length);
+                this.select.prop(
+                    'size', Math.max(2, this.select.children().length));
                 if (!field) {
                     return;
                 }