diff --git a/htdocs/core/modules/asset/doc/pdf_standard_asset.modules.php b/htdocs/core/modules/asset/doc/pdf_standard_asset.modules.php
index c28c033b1bb..ae5823861c4 100644
--- a/htdocs/core/modules/asset/doc/pdf_standard_asset.modules.php
+++ b/htdocs/core/modules/asset/doc/pdf_standard_asset.modules.php
@@ -286,7 +286,11 @@ class pdf_standard_asset extends ModelePDFAsset
 
 				// Set path to the background PDF File
 				if (getDolGlobalString('MAIN_ADD_PDF_BACKGROUND')) {
-					$pagecount = $pdf->setSourceFile($conf->mycompany->multidir_output[$object->entity].'/' . getDolGlobalString('MAIN_ADD_PDF_BACKGROUND'));
+					$logodir = $conf->mycompany->dir_output;
+					if (!empty($conf->mycompany->multidir_output[$object->entity])) {
+						$logodir = $conf->mycompany->multidir_output[$object->entity];
+					}
+					$pagecount = $pdf->setSourceFile($logodir .'/' . getDolGlobalString('MAIN_ADD_PDF_BACKGROUND'));
 					$tplidx = $pdf->importPage(1);
 				}
 
diff --git a/htdocs/core/modules/stocktransfer/doc/pdf_eagle_proforma.modules.php b/htdocs/core/modules/stocktransfer/doc/pdf_eagle_proforma.modules.php
index 9c6ceccf901..c8982040b2c 100644
--- a/htdocs/core/modules/stocktransfer/doc/pdf_eagle_proforma.modules.php
+++ b/htdocs/core/modules/stocktransfer/doc/pdf_eagle_proforma.modules.php
@@ -275,7 +275,11 @@ class pdf_eagle_proforma extends ModelePDFCommandes
 				$pdf->SetFont(pdf_getPDFFont($outputlangs));
 				// Set path to the background PDF File
 				if (getDolGlobalString('MAIN_ADD_PDF_BACKGROUND')) {
-					$pagecount = $pdf->setSourceFile($conf->mycompany->multidir_output[$object->entity].'/' . getDolGlobalString('MAIN_ADD_PDF_BACKGROUND'));
+					$logodir = $conf->mycompany->dir_output;
+					if (!empty($conf->mycompany->multidir_output[$object->entity])) {
+						$logodir = $conf->mycompany->multidir_output[$object->entity];
+					}
+					$pagecount = $pdf->setSourceFile($logodir .'/' . getDolGlobalString('MAIN_ADD_PDF_BACKGROUND'));
 					$tplidx = $pdf->importPage(1);
 				}
 
diff --git a/htdocs/core/modules/supplier_invoice/doc/pdf_canelle.modules.php b/htdocs/core/modules/supplier_invoice/doc/pdf_canelle.modules.php
index a6bdd688a07..388b81de18f 100644
--- a/htdocs/core/modules/supplier_invoice/doc/pdf_canelle.modules.php
+++ b/htdocs/core/modules/supplier_invoice/doc/pdf_canelle.modules.php
@@ -250,7 +250,11 @@ class pdf_canelle extends ModelePDFSuppliersInvoices
 				$pdf->SetFont(pdf_getPDFFont($outputlangs));
 				// Set path to the background PDF File
 				if (getDolGlobalString('MAIN_ADD_PDF_BACKGROUND')) {
-					$pagecount = $pdf->setSourceFile($conf->mycompany->multidir_output[$object->entity].'/' . getDolGlobalString('MAIN_ADD_PDF_BACKGROUND'));
+					$logodir = $conf->mycompany->dir_output;
+					if (!empty($conf->mycompany->multidir_output[$object->entity])) {
+						$logodir = $conf->mycompany->multidir_output[$object->entity];
+					}
+					$pagecount = $pdf->setSourceFile($logodir .'/' . getDolGlobalString('MAIN_ADD_PDF_BACKGROUND'));
 					$tplidx = $pdf->importPage(1);
 				}