diff --git a/packing.py b/packing.py
index bd6d2c6c2b..0f3d8fcf87 100644
--- a/packing.py
+++ b/packing.py
@@ -114,6 +114,10 @@ class PackingIn(OSV):
     def set_incoming_moves(self, cursor, user, packing_id, name, value, arg,
             context=None):
         move_obj = self.pool.get('stock.move')
+
+        if not value:
+            return
+
         packing = self.browse(cursor, user, packing_id, context=context)
         move_ids = []
         for act in value:
@@ -157,6 +161,10 @@ class PackingIn(OSV):
     def set_inventory_moves(self, cursor, user, packing_id, name, value, arg,
             context=None):
         move_obj = self.pool.get('stock.move')
+
+        if not value:
+            return
+
         packing = self.browse(cursor, user, packing_id, context=context)
         move_ids = []
         for act in value:
@@ -383,6 +391,10 @@ class PackingOut(OSV):
     def set_outgoing_moves(self, cursor, user, packing_id, name, value, arg,
             context=None):
         move_obj = self.pool.get('stock.move')
+
+        if not value:
+            return
+
         packing = self.browse(cursor, user, packing_id, context=context)
         move_ids = []
         for act in value:
@@ -426,6 +438,10 @@ class PackingOut(OSV):
     def set_inventory_moves(self, cursor, user, packing_id, name, value, arg,
             context=None):
         move_obj = self.pool.get('stock.move')
+
+        if not value:
+            return
+
         packing = self.browse(cursor, user, packing_id, context=context)
         move_ids = []
         for act in value: