Hi,

I am trying add new product to e-commerce with variants(only when the product added to sales order). But once i add this variant, I am getting an index error: tuple index out of range ​when I try to open product detail page. Here is the traceback. How can I fix this problem. I did not change anything or code anything. I am just using custom Alan theme. 

Traceback (most recent call last):
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\addons\base\models\qweb.py", line 344, in _compiled_fn
    return compiled(self, append, new, options, log)
  File "<template>", line 1, in template_1452_39
  File "<template>", line 2, in body_call_content_38
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\models.py", line 5052, in __getitem__
    return self._browse((self._ids[key],), self.env)
IndexError: tuple index out of range

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\addons\base\models\ir_http.py", line 203, in _dispatch
    result = request.dispatch()
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\http.py", line 833, in dispatch
    r = self._call_function(**self.params)
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\http.py", line 344, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\service\model.py", line 97, in wrapper
    return f(dbname, *args, **kwargs)
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\http.py", line 340, in checked_call
    result.flatten()
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\http.py", line 1268, in flatten
    self.response.append(self.render())
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\http.py", line 1261, in render
    return env["ir.ui.view"].render_template(self.template, self.qcontext)
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\addons\base\models\ir_ui_view.py", line 1276, in render_template
    return self.browse(self.get_view_id(template)).render(values, engine)
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\addons\website\models\ir_ui_view.py", line 252, in render
    return super(View, self).render(values, engine=engine, minimal_qcontext=minimal_qcontext)
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\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 "C:\Program Files (x86)\Odoo 12.0e\server\odoo\addons\base\models\ir_ui_view.py", line 1285, in render
    return self.env[engine].render(self.id, qcontext)
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\addons\web_studio\models\ir_qweb.py", line 43, in render
    return super(IrQWeb, self).render(template, values=values, **options)
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\addons\base\models\ir_qweb.py", line 59, in render
    result = super(IrQWeb, self).render(id_or_xml_id, values=values, **context)
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\addons\base\models\qweb.py", line 272, in render
    self.compile(template, options)(self, body.append, values or {})
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\addons\base\models\qweb.py", line 351, 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: tuple index out of range
Traceback (most recent call last):
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\addons\base\models\qweb.py", line 344, in _compiled_fn
    return compiled(self, append, new, options, log)
  File "<template>", line 1, in template_1452_39
  File "<template>", line 2, in body_call_content_38
  File "C:\Program Files (x86)\Odoo 12.0e\server\odoo\models.py", line 5052, in __getitem__
    return self._browse((self._ids[key],), self.env)
IndexError: tuple index out of range

Error to render compiling AST
IndexError: tuple index out of range
Template: 1452
Path: /templates/t/t/div/section/div[2]/div[2]/form/div/t[3]/button
Node: <button type="button" role="button" class="d-none d-md-inline-block btn btn-secondary btn-lg mt8 o_add_compare_dyn" title="Compare" aria-label="Compare" t-att-data-product-product-id="product.product_variant_ids[0].id" data-action="o_comparelist" data-oe-model="ir.ui.view" data-oe-id="3232" data-oe-field="arch" data-oe-xpath="/data/xpath/t/button[1]"><span class="fa fa-balance-scale"/></button>