diff --git a/tryton/gui/window/win_import.py b/tryton/gui/window/win_import.py
index 03b38d39b6..aff8d38ae9 100644
--- a/tryton/gui/window/win_import.py
+++ b/tryton/gui/window/win_import.py
@@ -238,6 +238,9 @@ class WinImport(NoModal):
 
     def on_row_expanded(self, treeview, iter, path):
         child = self.model1.iter_children(iter)
+        # autodetect could call for node without children
+        if child is None:
+            return
         if self.model1.get_value(child, 0) is None:
             prefix_field = self.model1.get_value(iter, 1)
             name, model = self.fields[prefix_field]