diff --git a/htdocs/core/modules/commande/doc/pdf_edison.modules.php b/htdocs/core/modules/commande/doc/pdf_edison.modules.php
index a481ea62fba..788c6745003 100644
--- a/htdocs/core/modules/commande/doc/pdf_edison.modules.php
+++ b/htdocs/core/modules/commande/doc/pdf_edison.modules.php
@@ -298,8 +298,11 @@ class pdf_edison extends ModelePDFCommandes
 				$pdf->Output($file,'F');
 
 				// Actions on extra fields (by external module or standard code)
-				include_once(DOL_DOCUMENT_ROOT.'/core/class/hookmanager.class.php');
-				$hookmanager=new HookManager($this->db);
+				if (is_object($hookmanager))
+				{
+					include_once(DOL_DOCUMENT_ROOT.'/core/class/hookmanager.class.php');
+					$hookmanager=new HookManager($this->db);
+				}
 				$hookmanager->callHooks(array('pdfgeneration'));
 				$parameters=array('file'=>$file,'object'=>$object,'outputlangs'=>$outputlangs);
 				global $action;
diff --git a/htdocs/core/modules/commande/doc/pdf_einstein.modules.php b/htdocs/core/modules/commande/doc/pdf_einstein.modules.php
index 6e586244686..33b746ee98d 100644
--- a/htdocs/core/modules/commande/doc/pdf_einstein.modules.php
+++ b/htdocs/core/modules/commande/doc/pdf_einstein.modules.php
@@ -407,8 +407,11 @@ class pdf_einstein extends ModelePDFCommandes
 				$pdf->Output($file,'F');
 
 				// Actions on extra fields (by external module or standard code)
-				include_once(DOL_DOCUMENT_ROOT.'/core/class/hookmanager.class.php');
-				$hookmanager=new HookManager($this->db);
+				if (is_object($hookmanager))
+				{
+					include_once(DOL_DOCUMENT_ROOT.'/core/class/hookmanager.class.php');
+					$hookmanager=new HookManager($this->db);
+				}
 				$hookmanager->callHooks(array('pdfgeneration'));
 				$parameters=array('file'=>$file,'object'=>$object,'outputlangs'=>$outputlangs);
 				global $action;
diff --git a/htdocs/core/modules/facture/doc/pdf_crabe.modules.php b/htdocs/core/modules/facture/doc/pdf_crabe.modules.php
index 79193edfac6..fe5a8645d46 100755
--- a/htdocs/core/modules/facture/doc/pdf_crabe.modules.php
+++ b/htdocs/core/modules/facture/doc/pdf_crabe.modules.php
@@ -412,8 +412,11 @@ class pdf_crabe extends ModelePDFFactures
 				$pdf->Output($file,'F');
 
 				// Add pdfgeneration hook
-				include_once(DOL_DOCUMENT_ROOT.'/core/class/hookmanager.class.php');
-				$hookmanager=new HookManager($this->db);
+				if (is_object($hookmanager))
+				{
+					include_once(DOL_DOCUMENT_ROOT.'/core/class/hookmanager.class.php');
+					$hookmanager=new HookManager($this->db);
+				}
 				$hookmanager->callHooks(array('pdfgeneration'));
 				$parameters=array('file'=>$file,'object'=>$object,'outputlangs'=>$outputlangs);
 				global $action;
diff --git a/htdocs/core/modules/facture/doc/pdf_oursin.modules.php b/htdocs/core/modules/facture/doc/pdf_oursin.modules.php
index d61dd3cdfa3..667f3c69b24 100755
--- a/htdocs/core/modules/facture/doc/pdf_oursin.modules.php
+++ b/htdocs/core/modules/facture/doc/pdf_oursin.modules.php
@@ -300,8 +300,11 @@ class pdf_oursin extends ModelePDFFactures
 				$pdf->Output($file,'F');
 
 				// Actions on extra fields (by external module or standard code)
-				include_once(DOL_DOCUMENT_ROOT.'/core/class/hookmanager.class.php');
-				$hookmanager=new HookManager($this->db);
+				if (is_object($hookmanager))
+				{
+					include_once(DOL_DOCUMENT_ROOT.'/core/class/hookmanager.class.php');
+					$hookmanager=new HookManager($this->db);
+				}
 				$hookmanager->callHooks(array('pdfgeneration'));
 				$parameters=array('file'=>$file,'object'=>$object,'outputlangs'=>$outputlangs);
 				global $action;
diff --git a/htdocs/core/modules/propale/doc/pdf_azur.modules.php b/htdocs/core/modules/propale/doc/pdf_azur.modules.php
index 37d509ae784..de95e1d6acf 100644
--- a/htdocs/core/modules/propale/doc/pdf_azur.modules.php
+++ b/htdocs/core/modules/propale/doc/pdf_azur.modules.php
@@ -393,8 +393,11 @@ class pdf_azur extends ModelePDFPropales
 				$pdf->Output($file,'F');
 
 				// Actions on extra fields (by external module or standard code)
-				include_once(DOL_DOCUMENT_ROOT.'/core/class/hookmanager.class.php');
-				$hookmanager=new HookManager($this->db);
+				if (is_object($hookmanager))
+				{
+					include_once(DOL_DOCUMENT_ROOT.'/core/class/hookmanager.class.php');
+					$hookmanager=new HookManager($this->db);
+				}
 				$hookmanager->callHooks(array('pdfgeneration'));
 				$parameters=array('file'=>$file,'object'=>$object,'outputlangs'=>$outputlangs);
 				global $action;
diff --git a/htdocs/core/modules/propale/doc/pdf_jaune.modules.php b/htdocs/core/modules/propale/doc/pdf_jaune.modules.php
index 2873569fab9..062453b9696 100644
--- a/htdocs/core/modules/propale/doc/pdf_jaune.modules.php
+++ b/htdocs/core/modules/propale/doc/pdf_jaune.modules.php
@@ -393,8 +393,11 @@ class pdf_jaune extends ModelePDFPropales
 				$pdf->Output($file,'F');
 
 				// Actions on extra fields (by external module or standard code)
-				include_once(DOL_DOCUMENT_ROOT.'/core/class/hookmanager.class.php');
-				$hookmanager=new HookManager($this->db);
+				if (is_object($hookmanager))
+				{
+					include_once(DOL_DOCUMENT_ROOT.'/core/class/hookmanager.class.php');
+					$hookmanager=new HookManager($this->db);
+				}
 				$hookmanager->callHooks(array('pdfgeneration'));
 				$parameters=array('file'=>$file,'object'=>$object,'outputlangs'=>$outputlangs);
 				global $action;
diff --git a/htdocs/core/modules/supplier_invoice/pdf/pdf_canelle.modules.php b/htdocs/core/modules/supplier_invoice/pdf/pdf_canelle.modules.php
index 4cd34062c50..4761a6b38b0 100755
--- a/htdocs/core/modules/supplier_invoice/pdf/pdf_canelle.modules.php
+++ b/htdocs/core/modules/supplier_invoice/pdf/pdf_canelle.modules.php
@@ -398,8 +398,11 @@ class pdf_canelle extends ModelePDFSuppliersInvoices
 				$pdf->Output($file,'F');
 
 				// Actions on extra fields (by external module or standard code)
-				include_once(DOL_DOCUMENT_ROOT.'/core/class/hookmanager.class.php');
-				$hookmanager=new HookManager($this->db);
+				if (is_object($hookmanager))
+				{
+					include_once(DOL_DOCUMENT_ROOT.'/core/class/hookmanager.class.php');
+					$hookmanager=new HookManager($this->db);
+				}
 				$hookmanager->callHooks(array('pdfgeneration'));
 				$parameters=array('file'=>$file,'object'=>$object,'outputlangs'=>$outputlangs);
 				global $action;
diff --git a/htdocs/core/modules/supplier_order/pdf/pdf_muscadet.modules.php b/htdocs/core/modules/supplier_order/pdf/pdf_muscadet.modules.php
index 257b44340fb..1ef9a8c75f0 100644
--- a/htdocs/core/modules/supplier_order/pdf/pdf_muscadet.modules.php
+++ b/htdocs/core/modules/supplier_order/pdf/pdf_muscadet.modules.php
@@ -406,8 +406,11 @@ class pdf_muscadet extends ModelePDFSuppliersOrders
 
 
 				// Add pdfgeneration hook
-				include_once(DOL_DOCUMENT_ROOT.'/core/class/hookmanager.class.php');
-				$hookmanager=new HookManager($this->db);
+				if (is_object($hookmanager))
+				{
+					include_once(DOL_DOCUMENT_ROOT.'/core/class/hookmanager.class.php');
+					$hookmanager=new HookManager($this->db);
+				}
 				$hookmanager->callHooks(array('pdfgeneration'));
 				$parameters=array('file'=>$file,'object'=>$object,'outputlangs'=>$outputlangs);
 				global $action;