diff --git a/tryton/gui/window/view_form/view/form_gtk/textbox.py b/tryton/gui/window/view_form/view/form_gtk/textbox.py
index 583c11cce0..176189bf19 100644
--- a/tryton/gui/window/view_form/view/form_gtk/textbox.py
+++ b/tryton/gui/window/view_form/view/form_gtk/textbox.py
@@ -134,6 +134,8 @@ class TextBox(WidgetInterface, TranslateMixin):
         field.set_client(record, self.get_value())
 
     def set_buffer(self, value):
+        if value == self.get_value():
+            return
         buf = self.textview.get_buffer()
         buf.delete(buf.get_start_iter(), buf.get_end_iter())
         iter_start = buf.get_start_iter()