diff --git a/htdocs/compta/facture/class/facture.class.php b/htdocs/compta/facture/class/facture.class.php
index 00734ccb680..0269babd064 100644
--- a/htdocs/compta/facture/class/facture.class.php
+++ b/htdocs/compta/facture/class/facture.class.php
@@ -2518,6 +2518,20 @@ class Facture extends CommonInvoice
 		{
 			$keymin = strtolower($key);
 			$i = (int) preg_replace('/[^0-9]/', '', $key);
+			if ($i == 1) {
+				if (!is_object($this->thirdparty)) {
+					$langs->load('errors');
+					$this->error = $langs->trans('ErrorInvoiceLoadThirdParty', $this->ref);
+					dol_syslog(__METHOD__.' '.$this->error, LOG_ERR);
+					return -1;
+				}
+			}
+			if (!property_exists($this->thirdparty, $keymin)) {
+				$langs->load('errors');
+				$this->error = $langs->trans('ErrorInvoiceLoadThirdPartyKey', $keymin, $this->ref);
+				dol_syslog(__METHOD__.' '.$this->error, LOG_ERR);
+				return -1;
+			}
 			$vallabel = $this->thirdparty->$keymin;
 
 			if ($i > 0)
diff --git a/htdocs/langs/en_US/errors.lang b/htdocs/langs/en_US/errors.lang
index 087fcba9e56..94a1cf16a38 100644
--- a/htdocs/langs/en_US/errors.lang
+++ b/htdocs/langs/en_US/errors.lang
@@ -257,6 +257,8 @@ ErrorLanguageRequiredIfPageIsTranslationOfAnother=The language of new page must
 ErrorLanguageMustNotBeSourceLanguageIfPageIsTranslationOfAnother=The language of new page must not be the source language if it is set as a translation of another page
 ErrorAParameterIsRequiredForThisOperation=A parameter is mandatory for this operation
 ErrorYouMustFirstSetupYourChartOfAccount=You must first setup your chart of account
+ErrorInvoiceLoadThirdParty=Can't load third-party object for invoice "%s"
+ErrorInvoiceLoadThirdPartyKey=Third-party key "%s" no set for invoice "%s"
 
 # Warnings
 WarningParamUploadMaxFileSizeHigherThanPostMaxSize=Your PHP parameter upload_max_filesize (%s) is higher than PHP parameter post_max_size (%s). This is not a consistent setup.
@@ -289,4 +291,4 @@ WarningFailedToAddFileIntoDatabaseIndex=Warning, failed to add file entry into E
 WarningTheHiddenOptionIsOn=Warning, the hidden option <b>%s</b> is on.
 WarningCreateSubAccounts=Warning, you can't create directly a sub account, you must create a third party or an user and assign them an accounting code to find them in this list
 WarningAvailableOnlyForHTTPSServers=Available only if using HTTPS secured connection.
-WarningModuleXDisabledSoYouMayMissEventHere=Module %s has not been enabled. So you may miss a lot of event here.
\ No newline at end of file
+WarningModuleXDisabledSoYouMayMissEventHere=Module %s has not been enabled. So you may miss a lot of event here.