diff --git a/addons/hr_timesheet/hr_timesheet.py b/addons/hr_timesheet/hr_timesheet.py
index cd223049608..1124aa7afbb 100644
--- a/addons/hr_timesheet/hr_timesheet.py
+++ b/addons/hr_timesheet/hr_timesheet.py
@@ -71,7 +71,10 @@ class hr_analytic_timesheet(osv.osv):
 		emp_obj = self.pool.get('hr.employee')
 		emp_id = emp_obj.search(cr, uid, [('user_id', '=', uid)])
 		if emp_id:
-			return emp_obj.browse(cr, uid, emp_id[0], context).product_id.uom_id.id
+			emp=emp_obj.browse(cr, uid, emp_id[0], context)
+			if not emp.product_id:
+				raise osv.except_osv('No product !', "The employee haven't an associated product")
+			return emp.product_id.uom_id.id
 		return False
 
 	def _getGeneralAccount(self, cr, uid, context):