Fatal error: Call to a member function update() on a non-object

OK I've found that is I clear my scheduled tasks I am able to run the cron again so maybe there is something up with the rules I've set up

array (
  'rules' => 
  array (
    'rules_17' => 
    array (
      '#type' => 'rule',
      '#set' => 'event_node_insert',
      '#label' => 'Saving event',
      '#active' => 1,
      '#weight' => '0',
      '#categories' => 
      array (
      ),
      '#status' => 'custom',
      '#conditions' => 
      array (
        0 => 
        array (
          '#type' => 'condition',
          '#settings' => 
          array (
            'type' => 
            array (
              'events' => 'events',
            ),
            '#argument map' => 
            array (
              'node' => 'node',
            ),
          ),
          '#name' => 'rules_condition_content_is_type',
          '#info' => 
          array (
            'label' => 'Created content is Events',
            'arguments' => 
            array (
              'node' => 
              array (
                'type' => 'node',
                'label' => 'Content',
              ),
            ),
            'module' => 'Node',
          ),
          '#weight' => 0,
        ),
      ),
      '#actions' => 
      array (
        1 => 
        array (
          '#type' => 'action',
          '#settings' => 
          array (
            'task_date' => '[node:field_event_date-date] 18:00:00',
            '#argument map' => 
            array (
              'node' => 'node',
            ),
            '#eval input' => 
            array (
              'token_rules_input_evaluator' => 
              array (
                'task_date' => 
                array (
                  0 => 'node',
                ),
              ),
            ),
          ),
          '#name' => 'rules_action_schedule_set_rules_expire_event',
          '#info' => 
          array (
            'arguments' => 
            array (
              'task_date' => 
              array (
                'type' => 'date',
                'label' => 'Scheduled evaluation date',
              ),
              'node' => 
              array (
                'label' => 'Content',
                'type' => 'node',
              ),
            ),
            'label' => 'Schedule Expire Event',
            'status' => 'custom',
            'categories' => 
            array (
            ),
            'module' => 'Rule Scheduler',
            'base' => 'rules_scheduler_action',
            'set' => 'rules_expire_event',
          ),
          '#weight' => 0,
        ),
      ),
      '#version' => 6003,
    ),
    'rules_18' => 
    array (
      '#type' => 'rule',
      '#set' => 'event_node_update',
      '#label' => 'Editing event',
      '#active' => 1,
      '#weight' => '0',
      '#categories' => 
      array (
      ),
      '#status' => 'custom',
      '#conditions' => 
      array (
        0 => 
        array (
          '#weight' => 0,
          '#info' => 
          array (
            'label' => 'Updated content is Events',
            'arguments' => 
            array (
              'node' => 
              array (
                'type' => 'node',
                'label' => 'Content',
              ),
            ),
            'module' => 'Node',
          ),
          '#name' => 'rules_condition_content_is_type',
          '#settings' => 
          array (
            'type' => 
            array (
              'events' => 'events',
            ),
            '#argument map' => 
            array (
              'node' => 'node',
            ),
          ),
          '#type' => 'condition',
        ),
      ),
      '#actions' => 
      array (
        0 => 
        array (
          '#weight' => 0,
          '#type' => 'action',
          '#settings' => 
          array (
            'task_date' => '[node:field_event_date-date] 18:00:00',
            '#argument map' => 
            array (
              'node' => 'node',
            ),
            '#eval input' => 
            array (
              'token_rules_input_evaluator' => 
              array (
                'task_date' => 
                array (
                  0 => 'node',
                ),
              ),
            ),
          ),
          '#name' => 'rules_action_schedule_set_rules_expire_event',
          '#info' => 
          array (
            'arguments' => 
            array (
              'task_date' => 
              array (
                'type' => 'date',
                'label' => 'Scheduled evaluation date',
              ),
              'node' => 
              array (
                'label' => 'Content',
                'type' => 'node',
              ),
            ),
            'label' => 'Schedule Expire Event',
            'status' => 'custom',
            'categories' => 
            array (
            ),
            'module' => 'Rule Scheduler',
            'base' => 'rules_scheduler_action',
            'set' => 'rules_expire_event',
          ),
        ),
      ),
      '#version' => 6003,
    ),
    'rules_14' => 
    array (
      '#type' => 'rule',
      '#set' => 'rules_expire_event',
      '#label' => 'Expire the event',
      '#active' => 1,
      '#weight' => '0',
      '#categories' => 
      array (
      ),
      '#status' => 'custom',
      '#conditions' => 
      array (
      ),
      '#actions' => 
      array (
        0 => 
        array (
          '#weight' => 0,
          '#type' => 'action',
          '#settings' => 
          array (
            'field_name' => 'field_product_offline',
            '#argument map' => 
            array (
              'node' => 'node',
            ),
            'value' => 
            array (
              0 => 
              array (
                'value' => '1',
              ),
            ),
            'code' => '',
          ),
          '#name' => 'content_rules_action_populate_field',
          '#info' => 
          array (
            'label' => 'Populate Content\'s field \'field_product_offline\'',
            'arguments' => 
            array (
              'node' => 
              array (
                'type' => 'node',
                'label' => 'Content',
              ),
            ),
            'eval input' => 
            array (
              0 => 'code',
              1 => 'value|0|value',
            ),
            'module' => 'CCK',
          ),
        ),
      ),
      '#version' => 6003,
    ),
  ),
  'rule_sets' => 
  array (
    'rules_expire_event' => 
    array (
      'arguments' => 
      array (
        'node' => 
        array (
          'label' => 'Content',
          'type' => 'node',
        ),
      ),
      'label' => 'Expire Event',
      'status' => 'custom',
      'categories' => 
      array (
      ),
    ),
  ),
)