--- a/src/pyams_gis/widget/area.py	Mon Dec 11 15:26:52 2017 +0100
+++ b/src/pyams_gis/widget/area.py	Wed Jan 10 12:44:32 2018 +0100
@@ -56,7 +56,7 @@
 
     def updateWidgets(self, setErrors=True):
         super(GeoAreaWidget, self).updateWidgets()
-        widgets = self.widgets
+        widgets = self.subform.widgets
         widgets['x1'].input_css_class = 'col-md-2'
         widgets['y1'].input_css_class = 'col-md-2'
         widgets['x2'].input_css_class = 'col-md-2'