I'm trying to attach automatically more than one report when sending an email, but I'm facing this error : 

"Invalid value %r in domain term %r" % (right, leaf)AssertionError: Invalid value sale.order(15391,) in domain term ('report_name', '=', sale.order(15391,))

The part of the code where it fails:

for rec in records:
    condition = report_line.condition
                
    if condition and condition.strip():
        condition_result = self.render_template(condition, template.model, rec.id)
                   
        if not condition_result or not safe_eval(condition_result):
            continue
             
    report_name = self.render_template(report_line.report_name, template.model, rec.id)
                
    report = report_line.report_template_id   
    report_service = report.report_name
    result = self.env['report'].get_pdf(rec, report_service)

Specifically in the last line (rec).

This module is from OCA, "Email Template Multi Report".

Thanks