diff --git a/addons/hr_payroll/models/hr_payslip.py b/addons/hr_payroll/models/hr_payslip.py
index 726e5efe37543..c9d14c47495b9 100644
--- a/addons/hr_payroll/models/hr_payslip.py
+++ b/addons/hr_payroll/models/hr_payslip.py
@@ -190,7 +190,8 @@ def get_worked_day_lines(self, contracts, date_from, date_to):
                     leave_time = (interval[1] - interval[0]).seconds / 3600
                     current_leave_struct['number_of_hours'] += leave_time
                     work_hours = contract.employee_id.get_day_work_hours_count(interval[0].date(), calendar=contract.resource_calendar_id)
-                    current_leave_struct['number_of_days'] += leave_time / work_hours
+                    if work_hours:
+                        current_leave_struct['number_of_days'] += leave_time / work_hours
 
             # compute worked days
             work_data = contract.employee_id.get_work_days_data(day_from, day_to, calendar=contract.resource_calendar_id)
diff --git a/addons/resource/models/resource_mixin.py b/addons/resource/models/resource_mixin.py
index fd5314679986c..fcee4086ca32e 100644
--- a/addons/resource/models/resource_mixin.py
+++ b/addons/resource/models/resource_mixin.py
@@ -57,7 +57,8 @@ def get_work_days_data(self, from_datetime, to_datetime, calendar=None):
             theoric_hours = self.get_day_work_hours_count(day_intervals[0][0].date(), calendar=calendar)
             work_time = sum((interval[1] - interval[0] for interval in day_intervals), timedelta())
             total_work_time += work_time
-            days_count += float_utils.round((work_time.total_seconds() / 3600 / theoric_hours) * 4) / 4
+            if theoric_hours:
+                days_count += float_utils.round((work_time.total_seconds() / 3600 / theoric_hours) * 4) / 4
         return {
             'days': days_count,
             'hours': total_work_time.total_seconds() / 3600,
@@ -80,7 +81,8 @@ def get_leaves_day_count(self, from_datetime, to_datetime, calendar=None):
         for day_intervals in calendar._iter_leave_intervals(from_datetime, to_datetime, self.resource_id.id):
             theoric_hours = self.get_day_work_hours_count(day_intervals[0][0].date(), calendar=calendar)
             leave_time = sum((interval[1] - interval[0] for interval in day_intervals), timedelta())
-            days_count += float_utils.round((leave_time.total_seconds() / 3600 / theoric_hours) * 4) / 4
+            if theoric_hours:
+                days_count += float_utils.round((leave_time.total_seconds() / 3600 / theoric_hours) * 4) / 4
         return days_count
 
     def iter_leaves(self, from_datetime, to_datetime, calendar=None):