when i push the register payment in vendors bill or customer invoices , pop-up screen appears but if i do not change the amount , and directly push validate . it gives me below error . but if i change the amount it accepts

please help what can cause it ? i am on odoo 12 CE

qte

Error:
Server Error

Traceback (most recent call last):
File "/opt/odoo/odoo-server/odoo/http.py", line 654, in _handle_exception
return super(JsonRequest, self)._handle_exception(exception)
File "/opt/odoo/odoo-server/odoo/http.py", line 312, in _handle_exception
raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
File "/opt/odoo/odoo-server/odoo/tools/pycompat.py", line 87, in reraise
raise value
File "/opt/odoo/odoo-server/odoo/http.py", line 696, in dispatch
result = self._call_function(**self.params)
File "/opt/odoo/odoo-server/odoo/http.py", line 344, in _call_function
return checked_call(self.db, *args, **kwargs)
File "/opt/odoo/odoo-server/odoo/service/model.py", line 97, in wrapper
return f(dbname, *args, **kwargs)
File "/opt/odoo/odoo-server/odoo/http.py", line 337, in checked_call
result = self.endpoint(*a, **kw)
File "/opt/odoo/odoo-server/odoo/http.py", line 939, in __call__
return self.method(*args, **kw)
File "/opt/odoo/odoo-server/odoo/http.py", line 517, in response_wrap
response = f(*args, **kw)
File "/opt/odoo/odoo-server/addons/web/controllers/main.py", line 966, in call_button
action = self._call_kw(model, method, args, {})
File "/opt/odoo/odoo-server/addons/web/controllers/main.py", line 954, in _call_kw
return call_kw(request.env[model], method, args, kwargs)
File "/opt/odoo/odoo-server/odoo/api.py", line 749, in call_kw
return _call_kw_multi(method, model, args, kwargs)
File "/opt/odoo/odoo-server/odoo/api.py", line 736, in _call_kw_multi
result = method(recs, *args, **kwargs)
File "/opt/odoo/odoo-server/addons/account/models/account_payment.py", line 651, in action_validate_invoice_payment
return self.post()
File "/opt/odoo/odoo-server/addons/payment/models/account_payment.py", line 96, in post
res = super(AccountPayment, self - payments_need_trans).post()
File "/opt/odoo/odoo-server/addons/account_check_printing/models/account_payment.py", line 67, in post
res = super(AccountPayment, self).post()
File "/opt/odoo/odoo-server/addons/account/models/account_payment.py", line 626, in post
move = rec._create_payment_entry(amount)
File "/opt/odoo/odoo-server/addons/account/models/account_payment.py", line 699, in _create_payment_entry
self.invoice_ids.register_payment(counterpart_aml)
File "/opt/odoo/odoo-server/addons/account/models/account_invoice.py", line 1017, in register_payment
return (line_to_reconcile + payment_line).reconcile(writeoff_acc_id, writeoff_journal_id)
File "/opt/odoo/odoo-server/addons/hr_expense/models/account_move_line.py", line 15, in reconcile
res = super(AccountMoveLine, self).reconcile(writeoff_acc_id=writeoff_acc_id, writeoff_journal_id=writeoff_journal_id)
File "/opt/odoo/odoo-server/addons/account/models/account_move.py", line 917, in reconcile
remaining_moves = self.auto_reconcile_lines()
File "/opt/odoo/odoo-server/addons/account/models/account_move.py", line 888, in auto_reconcile_lines
ret = self._reconcile_lines(debit_moves, credit_moves, field)
File "/opt/odoo/odoo-server/addons/account/models/account_move.py", line 870, in _reconcile_lines
self.recompute()
File "/opt/odoo/odoo-server/odoo/models.py", line 5212, in recompute
target._write(dict(vals))
File "/opt/odoo/odoo-server/addons/account/models/account_invoice.py", line 545, in _write
(reconciled & pre_reconciled).filtered(lambda invoice: invoice.state == 'open').action_invoice_paid()
File "/opt/odoo/odoo-server/addons/sale/models/account_invoice.py", line 72, in action_invoice_paid
res = super(AccountInvoice, self).action_invoice_paid()
File "/opt/odoo/odoo-server/addons/account/models/account_invoice.py", line 928, in action_invoice_paid
invoice.write({'state': 'in_payment'})
File "/opt/odoo/odoo-server/addons/purchase/models/account_invoice.py", line 165, in write
result = result and super(AccountInvoice, invoice).write(vals)
File "/opt/odoo/odoo-server/addons/mail/models/mail_thread.py", line 322, in write
result = super(MailThread, self).write(values)
File "/opt/odoo/odoo-server/addons/mail/models/mail_activity.py", line 569, in write
return super(MailActivityMixin, self).write(vals)
File "/opt/odoo/odoo-server/odoo/models.py", line 3259, in write
self._write(store_vals)
File "/opt/odoo/odoo-server/addons/account/models/account_invoice.py", line 542, in _write
res = super(AccountInvoice, self)._write(vals)
File "/opt/odoo/odoo-server/odoo/models.py", line 3338, in _write
val = field.convert_to_column(val, self, vals)
File "/opt/odoo/odoo-server/odoo/fields.py", line 1941, in convert_to_column
value = self.convert_to_cache(value, record)
File "/opt/odoo/odoo-server/odoo/fields.py", line 1953, in convert_to_cache
raise ValueError("Wrong value for %s: %r" % (self, value))
ValueError: Wrong value for account.invoice.state: 'in_payment'

uqte