diff --git a/addons/mrp/report/mrp_report_mo_overview.py b/addons/mrp/report/mrp_report_mo_overview.py
index d8ef6ac8730..bf76065c940 100644
--- a/addons/mrp/report/mrp_report_mo_overview.py
+++ b/addons/mrp/report/mrp_report_mo_overview.py
@@ -57,8 +57,8 @@ class ReportMoOverview(models.AbstractModel):
         doc['show_uom'] = self.env.user.user_has_groups('uom.group_uom')
         if doc['show_uom']:
             footer_colspan += 1
-        doc['data_mo_unit_cost'] = doc['summary'].get('mo_cost', 0) / doc['summary'].get('quantity', 1)
-        doc['data_real_unit_cost'] = doc['summary'].get('real_cost', 0) / doc['summary'].get('quantity', 1)
+        doc['data_mo_unit_cost'] = doc['summary'].get('mo_cost', 0) / (doc['summary'].get('quantity') or 1)
+        doc['data_real_unit_cost'] = doc['summary'].get('real_cost', 0) / (doc['summary'].get('quantity') or 1)
         doc['unfolded_ids'] = set(json.loads(data.get('unfoldedIds', '[]')))
         doc['footer_colspan'] = footer_colspan
         doc['get_color'] = get_color
@@ -93,8 +93,8 @@ class ReportMoOverview(models.AbstractModel):
 
     def _get_report_extra_lines(self, summary, components, operations, production_done=False):
         currency = summary.get('currency', self.env.company.currency_id)
-        unit_mo_cost = currency.round(summary.get('mo_cost', 0) / summary.get('quantity', 1))
-        unit_real_cost = currency.round(summary.get('real_cost', 0) / summary.get('quantity', 1))
+        unit_mo_cost = currency.round(summary.get('mo_cost', 0) / (summary.get('quantity') or 1))
+        unit_real_cost = currency.round(summary.get('real_cost', 0) / (summary.get('quantity') or 1))
         extras = {
             'unit_mo_cost': unit_mo_cost,
             'unit_mo_cost_decorator': self._get_comparison_decorator(unit_real_cost, unit_mo_cost, currency.rounding),
@@ -175,7 +175,7 @@ class ReportMoOverview(models.AbstractModel):
             'formatted_state': self._format_state(production, components),
             'quantity': production.product_qty if production.state != 'done' else production.qty_produced,
             'uom_name': production.product_uom_id.display_name,
-            'uom_precision': self._get_uom_precision(production.product_uom_id.rounding),
+            'uom_precision': self._get_uom_precision(production.product_uom_id.rounding or 0.01),
             'quantity_free': product.uom_id._compute_quantity(max(product.free_qty, 0), production.product_uom_id) if product.type == 'product' else False,
             'quantity_on_hand': product.uom_id._compute_quantity(product.qty_available, production.product_uom_id) if product.type == 'product' else False,
             'quantity_reserved': 0.0,
@@ -189,6 +189,8 @@ class ReportMoOverview(models.AbstractModel):
         }
 
     def _get_unit_cost(self, move):
+        if not move:
+            return 0.0
         return move.product_id.uom_id._compute_price(move.product_id.standard_price, move.product_uom)
 
     def _format_state(self, record, components=False):