diff --git a/htdocs/core/modules/facture/doc/pdf_crabe.modules.php b/htdocs/core/modules/facture/doc/pdf_crabe.modules.php
index c421ec6124ca6f42d96b4ec04b9a28c443ec46ae..092ae36fe282a893150baa636c4de9ff06aa5cf0 100644
--- a/htdocs/core/modules/facture/doc/pdf_crabe.modules.php
+++ b/htdocs/core/modules/facture/doc/pdf_crabe.modules.php
@@ -568,7 +568,7 @@ class pdf_crabe extends ModelePDFFactures
 					if (isset($object->type) && $object->type == 2 && ! empty($conf->global->INVOICE_POSITIVE_CREDIT_NOTE)) $sign=-1;
 					// Collecte des totaux par valeur de tva dans $this->tva["taux"]=total_tva
 					$prev_progress = $object->lines[$i]->get_prev_progress($object->id);
-					if ($prev_progress > 0) // Compute progress from previous situation
+					if ($prev_progress > 0 && !empty($object->lines[$i]->situation_percent)) // Compute progress from previous situation
 					{
 						if ($conf->multicurrency->enabled && $object->multicurrency_tx != 1) $tvaligne = $sign * $object->lines[$i]->multicurrency_total_tva * ($object->lines[$i]->situation_percent - $prev_progress) / $object->lines[$i]->situation_percent;
 						else $tvaligne = $sign * $object->lines[$i]->total_tva * ($object->lines[$i]->situation_percent - $prev_progress) / $object->lines[$i]->situation_percent;