I can not pay a vendor invoice

[hugo49]

Hello,
I can not pay a vendor invoice Here are the apache error logs.
Thank you.

Bonjour,
Je n'arrive pas à régler une facture fournisseur. Voici les logs erreur apache.
Merci.
[```
Mon Jun 11 09:56:32.382609 2018] [fcgid:warn] [pid 20605] [client xxx.xx.xxx.xx:60406] mod_fcgid: stderr: #1 /home/hugoprod-fr/domains/xx.xxxxxxxx.fr/public_html/htdocs/core/lib/pdf.lib.php(1102): pdf_getLinkedObjects(Object(FactureFournisseur), Object(Translate)), referer: xx.xxxxxxxx.fr/htdocs/fourn/facture/paiement.php
[Mon Jun 11 09:56:32.382615 2018] [fcgid:warn] [pid 20605] [client xxx.xx.xxx.xx:60406] mod_fcgid: stderr: #2 /home/hugoprod-fr/domains/xx.xxxxxxxx.fr/public_html/htdocs/core/modules/supplier_invoice/pdf/pdf_canelle.modules.php(1086): pdf_writeLinkedObjects(Object(TCPDI), Object(FactureFournisseur), Object(Translate), 100, 25, 100, 3, 'R', 10), referer: xx.xxxxxxxx.fr/htdocs/fourn/facture/paiement.php
[Mon Jun 11 09:56:32.382621 2018] [fcgid:warn] [pid 20605] [client xxx.xx.xxx.xx:60406] mod_fcgid: stderr: #3 /home/hugoprod-fr/domains/xx.xxxxxxxx.fr/public_html/htdocs/core/modules/supplier_invoice/pdf/pdf_canelle.modules.php(263): pdf_canelle->_pagehead(Object(TCPDI), Object(FactureFournisseur), 1, Object(Translate)), referer: xx.xxxxxxxx.fr/htdocs/fourn/facture/paiement.php
[Mon Jun 11 09:56:32.382627 2018] [fcgid:warn] [pid 20605] [client xxx.xx.xxx.xx:60406] mod_fcgid: stderr: #4 /home/hugoprod-fr/domains/xx.xxxxxxxx.fr/public_html/htdocs/core/class/commonobject.class.php(4171): pdf_canelle->write_fil in /home/hugoprod-fr/domains/xx.xxxxxxxx.fr/public_html/htdocs/core/class/commonobject.class.php on line 2823, referer: xx.xxxxxxxx.fr/htdocs/fourn/facture/paiement.php
[Mon Jun 11 09:58:10.497945 2018] [fcgid:warn] [pid 20570] [client xxx.xx.xxx.xx:60532] mod_fcgid: stderr: PHP Fatal error: Uncaught Error: Cannot access empty property in /home/hugoprod-fr/domains/xx.xxxxxxxx.fr/public_html/htdocs/core/class/commonobject.class

## Environment
- **V 7.2**: 
- **Ubuntu server 16.04**
- **PHP**: 7.0.30-1+ubuntu16.04.1+deb.sury.org+1

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