Timer.start TypeError: unsupported operand type(s) for +: 'datetime.datetime' and 'NoneType'

@dannix wrote:

I’m really struggling to get this timer to accept a number of minutes from a input_number slider. Any help most appreciated.

This is the full error I receive when invoking timer.start automation

unsupported operand type(s) for +: 'datetime.datetime' and 'NoneType'

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/websocket_api/commands.py", line 133, in handle_call_service
    connection.context(msg),
  File "/usr/src/homeassistant/homeassistant/core.py", line 1236, in async_call
    await asyncio.shield(self._execute_service(handler, service_call))
  File "/usr/src/homeassistant/homeassistant/core.py", line 1261, in _execute_service
    await handler.func(service_call)
  File "/usr/src/homeassistant/homeassistant/helpers/entity_component.py", line 213, in handle_service
    self._platforms.values(), func, call, service_name, required_features
  File "/usr/src/homeassistant/homeassistant/helpers/service.py", line 348, in entity_service_call
    future.result()  # pop exception if have
  File "/usr/src/homeassistant/homeassistant/helpers/service.py", line 370, in _handle_service_platform_call
    await getattr(entity, func)(**data)
  File "/usr/src/homeassistant/homeassistant/components/timer/__init__.py", line 175, in async_start
    self._end = start + self._duration
TypeError: unsupported operand type(s) for +: 'datetime.datetime' and 'NoneType'

my config

## hot water boost
input_number:
  boost:
    name: boost
    initial: 30
    min: 30
    max: 120
    step: 10
    mode: slider

timer:
  boost:
    name: boost


#### my automations
- alias: Timer start
  trigger:
     platform: state
     entity_id: input_boolean.boost
     to: 'on'
  action:
   - service: timer.start
     data_template:
      entity_id: timer.boost
      duration: "{{ states('input_number.boost') | int * 60}}"


#   - service: switch.turn_on
#     entity_id: switch.water_boost_timer_switch_switch

- alias: Timer cancel
  trigger:
     platform: state
     entity_id: switch.water_boost_timer_switch_switch
     to: 'off'
  action:
     entity_id: timer.boost
     service: timer.cancel


- alias: Timer stop
  trigger:
     platform: event
     event_type: timer.finished
     event_data:
       entity_id: timer.boost
  action:
    entity_id: switch.water_boost_timer_switch_switch
    service: switch.turn_off

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