diff --git a/addons/stock_account/wizard/stock_valuation_history.py b/addons/stock_account/wizard/stock_valuation_history.py
index d3a53b1046a..49e66d490ce 100644
--- a/addons/stock_account/wizard/stock_valuation_history.py
+++ b/addons/stock_account/wizard/stock_valuation_history.py
@@ -125,7 +125,7 @@ class stock_history(osv.osv):
                 product_categ_id,
                 SUM(quantity) as quantity,
                 date,
-                SUM(price_unit_on_quant * quantity) / SUM(quantity) as price_unit_on_quant,
+                COALESCE(SUM(price_unit_on_quant * quantity) / NULLIF(SUM(quantity), 0), 0) as price_unit_on_quant,
                 source
                 FROM
                 ((SELECT