diff --git a/htdocs/core/modules/facture/doc/pdf_sponge.modules.php b/htdocs/core/modules/facture/doc/pdf_sponge.modules.php
index bb01f8bfd0b..57596f3edca 100644
--- a/htdocs/core/modules/facture/doc/pdf_sponge.modules.php
+++ b/htdocs/core/modules/facture/doc/pdf_sponge.modules.php
@@ -1640,7 +1640,8 @@ class pdf_sponge extends ModelePDFFactures
 		// Total remise
 		$total_line_remise = 0;
 		foreach ($object->lines as $i => $line) {
-			$total_line_remise += pdfGetLineTotalDiscountAmount($object, $i, $outputlangs, 2); // TODO: add this method to core/lib/pdf.lib
+			$resdiscount = pdfGetLineTotalDiscountAmount($object, $i, $outputlangs, 2);
+			$total_line_remise += (is_numeric($resdiscount) ? $resdiscount : 0);
 			// Gestion remise sous forme de ligne négative
 			if ($line->total_ht < 0) {
 				$total_line_remise += -$line->total_ht;