diff --git a/product/ERP5Form/ImageField.py b/product/ERP5Form/ImageField.py
index 375ff396ed71528da44ee43e11dc5a16382d2b55..b0e792fbe33bbc13bc8e18a1494d5c29106f5114 100644
--- a/product/ERP5Form/ImageField.py
+++ b/product/ERP5Form/ImageField.py
@@ -75,6 +75,8 @@ class ImageFieldWidget(Widget.TextWidget):
         """Render image field as a link to the image
         """
         # Url is already defined in value
+        if value is None:
+          return ''
         image = value
         alt = field.get_value('description') or \
               field.get_value('title')