when i access employee record and store in list, when i assign variable top five records it show me that particular error

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/flectra/http.py", line 658, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/usr/lib/python3/dist-packages/flectra/http.py", line 314, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "/usr/lib/python3/dist-packages/flectra/tools/pycompat.py", line 87, in reraise
    raise value
  File "/usr/lib/python3/dist-packages/flectra/http.py", line 700, in dispatch
    result = self._call_function(**self.params)
  File "/usr/lib/python3/dist-packages/flectra/http.py", line 346, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/flectra/service/model.py", line 97, in wrapper
    return f(dbname, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/flectra/http.py", line 339, in checked_call
    result = self.endpoint(*a, **kw)
  File "/usr/lib/python3/dist-packages/flectra/http.py", line 944, in __call__
    return self.method(*args, **kw)
  File "/usr/lib/python3/dist-packages/flectra/http.py", line 522, in response_wrap
    response = f(*args, **kw)
  File "/usr/lib/python3/dist-packages/flectra/addons/web/controllers/main.py", line 1090, in call_kw
    return self._call_kw(model, method, args, kwargs)
  File "/usr/lib/python3/dist-packages/flectra/addons/web/controllers/main.py", line 1082, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/usr/lib/python3/dist-packages/flectra/api.py", line 697, in call_kw
    return call_kw_model(method, model, args, kwargs)
  File "/usr/lib/python3/dist-packages/flectra/api.py", line 682, in call_kw_model
    result = method(recs, *args, **kwargs)
  File "/mnt/extra-addons/payroll_dashboard/models/payroll_dashboard.py", line 246, in get_payroll_details
    h_employee2 = lines[1]
IndexError: list index out of range

for i in payslips: 

names = i.employee_id.name 

lines.append(names) 

print("\n\n",lines) 

for j in range(len(lines)): 

lines.sort() 

for l in i.line_ids: 

if l.code =='NET': 

h_employee1 = lines[0] 

h_employee2 = lines[1] 

h_employee3 = lines[2] 

h_employee4 = lines[3] 

h_employee5 = lines[4]