diff --git a/htdocs/api/index.php b/htdocs/api/index.php
index 4fc772e67b9..03c3962495e 100644
--- a/htdocs/api/index.php
+++ b/htdocs/api/index.php
@@ -29,6 +29,15 @@
 
 use Luracast\Restler\Format\UploadFormat;
 
+// API endpoints return JSON (or XML). A stray PHP warning or notice in the
+// response body corrupts the parser on the caller side. Silence the display
+// of PHP messages here while keeping them in the server log so that the
+// problem is still observable to the operator (filefunc.inc.php only does
+// this when dolibarr_main_prod is set, which leaves development setups
+// emitting HTML into every API answer).
+@ini_set('display_errors', '0');
+@ini_set('log_errors', '1');
+
 if (!defined('NOCSRFCHECK')) {
 	define('NOCSRFCHECK', '1'); // Do not check anti CSRF attack test
 }