When I click the Grant Access button I get the following error, I can use the invoice urls for individual invoices but not to give my customer access to all their invoices:

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Invalid Operation

Kan QWeb-sjabloon niet weergeven: <<< big block of HTML that looks like an email template for the invitation of my customer >>>

Traceback (most recent call last): File &#34;/home/odoo/src/odoo/19.0/odoo/orm/models.py&#34;, line 5931, in ensure_one _id, = self._ids ^^^^ ValueError: not enough values to unpack (expected 1, got 0) During handling of the above exception, another exception occurred: Traceback (most recent call last): File &#34;/home/odoo/src/odoo/19.0/addons/mail/models/mail_render_mixin.py&#34;, line 367, in _render_template_qweb render_result = self.env[&#39;ir.qweb&#39;]._render( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File &#34;/home/odoo/src/odoo/19.0/odoo/addons/base/models/ir_qweb.py&#34;, line 725, in _render return Markup(&#39;&#39;.join(iterator)) ^^^^^^^^^^^^^^^^^ File &#34;/home/odoo/src/odoo/19.0/odoo/addons/base/models/ir_qweb.py&#34;, line 753, in _render_iterall for item in frame.iterator: File &#34;&lt;None&gt;&#34;, line 276, in template_etree_9 File &#34;&lt;None&gt;&#34;, line 121, in template_etree_9_content File &#34;/home/odoo/src/odoo/19.0/addons/auth_signup/models/res_partner.py&#34;, line 30, in _get_signup_url self.ensure_one() File &#34;/home/odoo/src/odoo/19.0/odoo/orm/models.py&#34;, line 5934, in ensure_one raise ValueError(&#34;Expected singleton: %s&#34; % self) ValueError: Expected singleton: res.partner() )