diff --git a/htdocs/core/lib/pdf.lib.php b/htdocs/core/lib/pdf.lib.php
index 5358fa5af52..92f2c55aa73 100644
--- a/htdocs/core/lib/pdf.lib.php
+++ b/htdocs/core/lib/pdf.lib.php
@@ -2619,7 +2619,9 @@ function pdf_getLinkedObjects(&$object, $outputlangs)
 		$parameters = array('linkedobjects' => $linkedobjects, 'outputlangs' => $outputlangs);
 		$action = '';
 		$reshook = $hookmanager->executeHooks('pdf_getLinkedObjects', $parameters, $object, $action); // Note that $action and $object may have been modified by some hooks
-		if ($reshook>0) {
+		if (empty($reshook)) {
+			$linkedobjects = array_replace($linkedobjects, $hookmanager->resArray); // array_replace is used to preserve keys
+		} elseif ($reshook>0) {
 			// The array must be reinserted even if it is empty because clearing the array could be one of the actions performed by the hook.
 			$linkedobjects = $hookmanager->resArray;
 		}