diff --git a/htdocs/core/modules/commande/modules_commande.php b/htdocs/core/modules/commande/modules_commande.php
index 87c03bfb2e3..bc5e31ff482 100644
--- a/htdocs/core/modules/commande/modules_commande.php
+++ b/htdocs/core/modules/commande/modules_commande.php
@@ -183,7 +183,8 @@ function commande_pdf_create($db, $object, $modele, $outputlangs, $hidedetails=0
 
 	// Search template files
 	$file=''; $classname=''; $filefound=0;
-	$dirmodels=array_merge(array('/'),$conf->modules_parts['models']);
+	$dirmodels=array('/');
+	if (is_array($conf->modules_parts['models'])) $dirmodels=array_merge($dirmodels,$conf->modules_parts['models']);
 	foreach($dirmodels as $reldir)
 	{
     	foreach(array('doc','pdf') as $prefix)
diff --git a/htdocs/core/modules/facture/modules_facture.php b/htdocs/core/modules/facture/modules_facture.php
index 4950e49c2d5..05a28abb77a 100644
--- a/htdocs/core/modules/facture/modules_facture.php
+++ b/htdocs/core/modules/facture/modules_facture.php
@@ -181,7 +181,8 @@ function facture_pdf_create($db, $object, $modele, $outputlangs, $hidedetails=0,
 
 	// Search template files
 	$file=''; $classname=''; $filefound=0;
-	$dirmodels=array_merge(array('/'),$conf->modules_parts['models']);
+	$dirmodels=array('/');
+	if (is_array($conf->modules_parts['models'])) $dirmodels=array_merge($dirmodels,$conf->modules_parts['models']);
 	foreach($dirmodels as $reldir)
 	{
     	foreach(array('doc','pdf') as $prefix)
diff --git a/htdocs/core/modules/propale/modules_propale.php b/htdocs/core/modules/propale/modules_propale.php
index 8e187e26d5e..77bc285e23a 100644
--- a/htdocs/core/modules/propale/modules_propale.php
+++ b/htdocs/core/modules/propale/modules_propale.php
@@ -184,7 +184,8 @@ function propale_pdf_create($db, $object, $modele, $outputlangs, $hidedetails=0,
 
 	// Search template files
 	$file=''; $classname=''; $filefound=0;
-	$dirmodels=array_merge(array('/'),$conf->modules_parts['models']);
+	$dirmodels=array('/');
+	if (is_array($conf->modules_parts['models'])) $dirmodels=array_merge($dirmodels,$conf->modules_parts['models']);
 	foreach($dirmodels as $reldir)
 	{
     	foreach(array('doc','pdf') as $prefix)
diff --git a/htdocs/core/modules/supplier_invoice/modules_facturefournisseur.php b/htdocs/core/modules/supplier_invoice/modules_facturefournisseur.php
index ad85e1dd1c0..c008e7bd711 100755
--- a/htdocs/core/modules/supplier_invoice/modules_facturefournisseur.php
+++ b/htdocs/core/modules/supplier_invoice/modules_facturefournisseur.php
@@ -70,13 +70,13 @@ function supplier_invoice_pdf_create($db, $object, $modele, $outputlangs)
 	$langs->load("suppliers");
 
 	$error=0;
-	
+
 	// Increase limit for PDF build
     $err=error_reporting();
     error_reporting(0);
     @set_time_limit(120);
     error_reporting($err);
-	
+
     $srctemplatepath='';
 
 	// Positionne modele sur le nom du modele de invoice fournisseur a utiliser
@@ -91,7 +91,7 @@ function supplier_invoice_pdf_create($db, $object, $modele, $outputlangs)
 		    $modele = 'canelle';
 		}
 	}
-	
+
     // If selected modele is a filename template (then $modele="modelname:filename")
 	$tmp=explode(':',$modele,2);
     if (! empty($tmp[1]))
@@ -99,16 +99,17 @@ function supplier_invoice_pdf_create($db, $object, $modele, $outputlangs)
         $modele=$tmp[0];
         $srctemplatepath=$tmp[1];
     }
-    	
+
 	// Search template file
 	$file=''; $classname=''; $filefound=0;
-	$dirmodels=array_merge(array('/'),$conf->modules_parts['models']);
+	$dirmodels=array('/');
+	if (is_array($conf->modules_parts['models'])) $dirmodels=array_merge($dirmodels,$conf->modules_parts['models']);
 	foreach($dirmodels as $reldir)
 	{
 		foreach(array('doc','pdf') as $prefix)
 		{
 			$file = $prefix."_".$modele.".modules.php";
-	
+
 			// On verifie l'emplacement du modele
 			$file=dol_buildpath($reldir."core/modules/supplier_invoice/pdf/".$file,0);
 			if (file_exists($file))
@@ -138,14 +139,14 @@ function supplier_invoice_pdf_create($db, $object, $modele, $outputlangs)
 			// we delete preview files
         	require_once(DOL_DOCUMENT_ROOT."/core/lib/files.lib.php");
 			dol_delete_preview($object);
-			
+
 			// Appel des triggers
 			include_once(DOL_DOCUMENT_ROOT . "/core/class/interfaces.class.php");
 			$interface=new Interfaces($db);
 			$result=$interface->run_triggers('BILL_BUILDDOC',$object,$user,$langs,$conf);
 			if ($result < 0) { $error++; $this->errors=$interface->errors; }
 			// Fin appel triggers
-			
+
 			return 1;
 		}
 		else
diff --git a/htdocs/core/modules/supplier_order/modules_commandefournisseur.php b/htdocs/core/modules/supplier_order/modules_commandefournisseur.php
index 8ed10c6cadb..18084b5d5e7 100644
--- a/htdocs/core/modules/supplier_order/modules_commandefournisseur.php
+++ b/htdocs/core/modules/supplier_order/modules_commandefournisseur.php
@@ -42,7 +42,7 @@ abstract class ModelePDFSuppliersOrders extends CommonDocGenerator
 
 	/**
 	 *  Return list of active generation modules
-	 *  
+	 *
 	 *  @param	DoliDB		$db		Database handler
 	 */
 	function liste_modeles($db)
@@ -153,17 +153,17 @@ function supplier_order_pdf_create($db, $object, $model, $outputlangs, $hidedeta
 {
 	global $conf,$langs;
 	$langs->load("suppliers");
-	
+
 	$error=0;
-	
+
 	// Increase limit for PDF build
 	$err=error_reporting();
 	error_reporting(0);
 	@set_time_limit(120);
 	error_reporting($err);
-	
+
 	$srctemplatepath='';
-	
+
 	// Positionne le modele sur le nom du modele a utiliser
 	if (! dol_strlen($modele))
 	{
@@ -176,7 +176,7 @@ function supplier_order_pdf_create($db, $object, $model, $outputlangs, $hidedeta
 			$modele = 'muscadet';
 		}
 	}
-	
+
 	// If selected modele is a filename template (then $modele="modelname:filename")
 	$tmp=explode(':',$modele,2);
 	if (! empty($tmp[1]))
@@ -184,16 +184,17 @@ function supplier_order_pdf_create($db, $object, $model, $outputlangs, $hidedeta
 		$modele=$tmp[0];
 		$srctemplatepath=$tmp[1];
 	}
-	
+
 	// Search template files
 	$file=''; $classname=''; $filefound=0;
-	$dirmodels=array_merge(array('/'),$conf->modules_parts['models']);
+	$dirmodels=array('/');
+	if (is_array($conf->modules_parts['models'])) $dirmodels=array_merge($dirmodels,$conf->modules_parts['models']);
 	foreach($dirmodels as $reldir)
 	{
 		foreach(array('doc','pdf') as $prefix)
 		{
 			$file = $prefix."_".$modele.".modules.php";
-	
+
 			// On verifie l'emplacement du modele
 			$file=dol_buildpath($reldir."core/modules/supplier_order/pdf/".$file,0);
 			if (file_exists($file))