diff --git a/addons/marketing_campaign/report/campaign_analysis.py b/addons/marketing_campaign/report/campaign_analysis.py
index f4a902f97cc..c9b643a4965 100644
--- a/addons/marketing_campaign/report/campaign_analysis.py
+++ b/addons/marketing_campaign/report/campaign_analysis.py
@@ -38,7 +38,7 @@ class campaign_analysis(osv.osv):
             wi_ids = self.pool.get('marketing.campaign.workitem').search(cr, uid,
                         [('segment_id.campaign_id', '=', ca_obj.campaign_id.id)])
             total_cost = ca_obj.activity_id.variable_cost + \
-                                (ca_obj.campaign_id.fixed_cost / len(wi_ids))
+                                ((ca_obj.campaign_id.fixed_cost or 0.00) / len(wi_ids))
             result[ca_obj.id] = total_cost
         return result
     _columns = {