diff --git a/ChangeLog.md b/ChangeLog.md
index be22db7..8834495 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,15 @@
 # CHANGELOG SENDRECURRINGINVOICEBYMAIL FOR [DOLIBARR ERP CRM](https://www.dolibarr.org)
 
+## 0.3.4
+
+Fix: the hook was also triggered by supplier invoices.
+Thanks to jpardenoy for the report and the fix.
+
+
+## 0.3.3
+
+Fix: adds CSRF protection.
+
 
 ## 0.3.2
 
diff --git a/class/actions_sendrecurringinvoicebymail.class.php b/class/actions_sendrecurringinvoicebymail.class.php
index 0209d6b..fcae1d4 100644
--- a/class/actions_sendrecurringinvoicebymail.class.php
+++ b/class/actions_sendrecurringinvoicebymail.class.php
@@ -84,6 +84,14 @@ class Actionssendrecurringinvoicebymail
         $error = 0; // Error counter
 
         $facturerec = $parameters['facturerec'];
+        // Since Dolibarr 16, this hook is also used for the FactureFournisseurRec class.
+        if (! $facturerec instanceof FactureRec) {
+            return 0;
+        }
+
+        // Load our own object, linked to this facture
+        // (if it doesn't exist in database, fetch(,,true) will fill the object
+        // from the global mail template)
         $mailObject = new SRIBMCustomMailInfo($this->db);
         if ($mailObject->fetch(null, $facturerec->id, true) != 1) {
             dol_syslog("Error loading SRIBMCustomMailInfo for facture rec " . (isset($facturerec->id) ? $facturerec->id : "(facturerec->id not set ??)"));
diff --git a/core/modules/modsendrecurringinvoicebymail.class.php b/core/modules/modsendrecurringinvoicebymail.class.php
index f2a029d..b3517b4 100644
--- a/core/modules/modsendrecurringinvoicebymail.class.php
+++ b/core/modules/modsendrecurringinvoicebymail.class.php
@@ -69,7 +69,7 @@ class modsendrecurringinvoicebymail extends DolibarrModules
         $this->editor_url = 'https://code.bugness.org/Dolibarr/sendrecurringinvoicebymail';
 
         // Possible values for version are: 'development', 'experimental', 'dolibarr', 'dolibarr_deprecated' or a version string like 'x.y.z'
-        $this->version = '0.3.3';
+        $this->version = '0.3.4';
 
         //Url to the file with your last numberversion of this module
         //$this->url_last_version = 'http://www.example.com/versionmodule.txt';