From e924a8a481c780f436a81025ab99b83d7dfee5d6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Thu, 28 Oct 2021 09:04:55 +0200
Subject: [PATCH] Compare with previous value only if PYSON value is not null

issue10900
review385281003
---
 src/view/form.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/view/form.js b/src/view/form.js
index 9033b19d0a..66dfbc6d9f 100644
--- a/src/view/form.js
+++ b/src/view/form.js
@@ -5253,7 +5253,7 @@ function eval_pyson(value){
             var record = this.record;
             var field = this.field;
             var previous = field.get_client(record);
-            if (previous && Sao.common.compare(
+            if (value && previous && Sao.common.compare(
                 value, this.encoder.encode(this.decoder.decode(previous)))) {
                 value = previous;
             }