[12.0] Exception when printing invoice with set fixed discount on invoice line [account_invoice_fixed_discount]

[marylla]

Hi everyone, I get an exception when printing an invoice after setting a fixed discount on a invoice line.

What I did:

• activate developers mode
• install "account_invoice_fixed_discount"
  • no other account_invoice-modules are installed
• create a customer or a supplier invoice
• add one or several invoice lines (no discounts)
• print the invoice -> everything is fine
• edit one invoice line and set fixed discount
• print the invoice -> exception

The exception I got:

Odoo Server Error
Traceback (most recent call last):
  File "/.repo_requirements/odoo/odoo/addons/base/models/qweb.py", line 346, in _compiled_fn
    return compiled(self, append, new, options, log)
  File "<template>", line 1, in template_account_report_invoice_document_with_payments_506
  File "<template>", line 2, in body_call_content_505
  File "<template>", line 89, in foreach_483
  File "/.repo_requirements/odoo/odoo/addons/base/models/ir_qweb.py", line 368, in _get_field
    field = record._fields[field_name]
AttributeError: 'NoneType' object has no attribute '_fields'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/odoo/OCB-12.0/addons/web/controllers/main.py", line 1671, in report_download
    response = self.report_routes(reportname, docids=docids, converter=converter)
  File "/.repo_requirements/odoo/odoo/http.py", line 519, in response_wrap
    response = f(*args, **kw)
  File "/home/odoo/OCB-12.0/addons/web/controllers/main.py", line 1612, in report_routes
    pdf = report.with_context(context).render_qweb_pdf(docids, data=data)[0]
  File "/.repo_requirements/odoo/odoo/addons/base/models/ir_actions_report.py", line 711, in render_qweb_pdf
    html = self.with_context(context).render_qweb_html(res_ids, data=data)[0]
  File "/.repo_requirements/odoo/odoo/addons/base/models/ir_actions_report.py", line 751, in render_qweb_html
    return self.render_template(self.report_name, data), 'html'
  File "/.repo_requirements/odoo/odoo/addons/base/models/ir_actions_report.py", line 534, in render_template
    return view_obj.render_template(template, values)
  File "/.repo_requirements/odoo/odoo/addons/base/models/ir_ui_view.py", line 1284, in render_template
    return self.browse(self.get_view_id(template)).render(values, engine)
  File "/home/odoo/OCB-12.0/addons/web_editor/models/ir_ui_view.py", line 27, in render
    return super(IrUiView, self).render(values=values, engine=engine, minimal_qcontext=minimal_qcontext)
  File "/.repo_requirements/odoo/odoo/addons/base/models/ir_ui_view.py", line 1293, in render
    return self.env[engine].render(self.id, qcontext)
  File "/.repo_requirements/odoo/odoo/addons/base/models/ir_qweb.py", line 59, in render
    result = super(IrQWeb, self).render(id_or_xml_id, values=values, **context)
  File "/.repo_requirements/odoo/odoo/addons/base/models/qweb.py", line 274, in render
    self.compile(template, options)(self, body.append, values or {})
  File "/.repo_requirements/odoo/odoo/addons/base/models/qweb.py", line 348, in _compiled_fn
    raise e
  File "/.repo_requirements/odoo/odoo/addons/base/models/qweb.py", line 346, in _compiled_fn
    return compiled(self, append, new, options, log)
  File "<template>", line 1, in template_600_452
  File "<template>", line 2, in body_call_content_451
  File "<template>", line 3, in foreach_450
  File "/.repo_requirements/odoo/odoo/addons/base/models/qweb.py", line 353, in _compiled_fn
    raise QWebException("Error to render compiling AST", e, path, node and etree.tostring(node[0], encoding='unicode'), name)
odoo.addons.base.models.qweb.QWebException: 'NoneType' object has no attribute '_fields'
Traceback (most recent call last):
  File "/.repo_requirements/odoo/odoo/addons/base/models/qweb.py", line 346, in _compiled_fn
    return compiled(self, append, new, options, log)
  File "<template>", line 1, in template_account_report_invoice_document_with_payments_506
  File "<template>", line 2, in body_call_content_505
  File "<template>", line 89, in foreach_483
  File "/.repo_requirements/odoo/odoo/addons/base/models/ir_qweb.py", line 368, in _get_field
    field = record._fields[field_name]
AttributeError: 'NoneType' object has no attribute '_fields'

Error to render compiling AST
AttributeError: 'NoneType' object has no attribute '_fields'
Template: account.report_invoice_document_with_payments
Path: /templates/t/t/div/table/tbody/t[2]/tr/t[1]/td[6]/span
Node: <span t-field="l.discount_fixed"/>

I do not have the problem in Odoo 11. Can somebody check (and fix) this? Thanks a lot. :)

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