diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index f58bd0953ab..06405f28b01 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -5547,20 +5547,24 @@ class Form
 
 		if (! is_object($object->thirdparty)) $object->fetch_thirdparty();
 
-		$possiblelinks=array(
-			'propal'=>array('enabled'=>$conf->propal->enabled, 'perms'=>1, 'label'=>'LinkToProposal', 'sql'=>"SELECT s.rowid as socid, s.nom as name, s.client, t.rowid, t.ref, t.ref_client, t.total_ht FROM ".MAIN_DB_PREFIX."societe as s, ".MAIN_DB_PREFIX."propal as t WHERE t.fk_soc = s.rowid AND t.fk_soc = ".$object->thirdparty->id),
-			'order'=>array('enabled'=>$conf->commande->enabled, 'perms'=>1, 'label'=>'LinkToOrder', 'sql'=>"SELECT s.rowid as socid, s.nom as name, s.client, t.rowid, t.ref, t.ref_client, t.total_ht FROM ".MAIN_DB_PREFIX."societe as s, ".MAIN_DB_PREFIX."commande as t WHERE t.fk_soc = s.rowid AND t.fk_soc = ".$object->thirdparty->id),
-			'invoice'=>array('enabled'=>$conf->facture->enabled, 'perms'=>1, 'label'=>'LinkToInvoice', 'sql'=>"SELECT s.rowid as socid, s.nom as name, s.client, t.rowid, t.facnumber as ref, t.ref_client, t.total as total_ht FROM ".MAIN_DB_PREFIX."societe as s, ".MAIN_DB_PREFIX."facture as t WHERE t.fk_soc = s.rowid AND t.fk_soc = ".$object->thirdparty->id),
-			'contrat'=>array('enabled'=>$conf->contrat->enabled , 'perms'=>1, 'label'=>'LinkToContract', 'sql'=>"SELECT s.rowid as socid, s.nom as name, s.client, t.rowid, t.ref, t.ref_supplier, '' as total_ht FROM ".MAIN_DB_PREFIX."societe as s, ".MAIN_DB_PREFIX."contrat as t WHERE t.fk_soc = s.rowid AND t.fk_soc = ".$object->thirdparty->id),
-			'fichinter'=>array('enabled'=>$conf->ficheinter->enabled, 'perms'=>1, 'label'=>'LinkToIntervention', 'sql'=>"SELECT s.rowid as socid, s.nom as name, s.client, t.rowid, t.ref FROM ".MAIN_DB_PREFIX."societe as s, ".MAIN_DB_PREFIX."fichinter as t WHERE t.fk_soc = s.rowid AND t.fk_soc = ".$object->thirdparty->id),
-			'supplier_proposal'=>array('enabled'=>$conf->supplier_proposal->enabled , 'perms'=>1, 'label'=>'LinkToSupplierProposal', 'sql'=>"SELECT s.rowid as socid, s.nom as name, s.client, t.rowid, t.ref, '' as ref_supplier, t.total_ht FROM ".MAIN_DB_PREFIX."societe as s, ".MAIN_DB_PREFIX."supplier_proposal as t WHERE t.fk_soc = s.rowid AND t.fk_soc = ".$object->thirdparty->id),
-			'order_supplier'=>array('enabled'=>$conf->fournisseur->commande->enabled , 'perms'=>1, 'label'=>'LinkToSupplierOrder', 'sql'=>"SELECT s.rowid as socid, s.nom as name, s.client, t.rowid, t.ref, t.ref_supplier, t.total_ht FROM ".MAIN_DB_PREFIX."societe as s, ".MAIN_DB_PREFIX."commande_fournisseur as t WHERE t.fk_soc = s.rowid AND t.fk_soc = ".$object->thirdparty->id),
-			'invoice_supplier'=>array('enabled'=>$conf->fournisseur->facture->enabled , 'perms'=>1, 'label'=>'LinkToSupplierInvoice', 'sql'=>"SELECT s.rowid as socid, s.nom as name, s.client, t.rowid, t.ref, t.ref_supplier, t.total_ht FROM ".MAIN_DB_PREFIX."societe as s, ".MAIN_DB_PREFIX."facture_fourn as t WHERE t.fk_soc = s.rowid AND t.fk_soc = ".$object->thirdparty->id)
-		);
-
+		$possiblelinks=array();
+		if (is_object($object->thirdparty) && ! empty($object->thirdparty->id) && $object->thirdparty->id > 0)
+		{
+		    $possiblelinks=array(
+    			'propal'=>array('enabled'=>$conf->propal->enabled, 'perms'=>1, 'label'=>'LinkToProposal', 'sql'=>"SELECT s.rowid as socid, s.nom as name, s.client, t.rowid, t.ref, t.ref_client, t.total_ht FROM ".MAIN_DB_PREFIX."societe as s, ".MAIN_DB_PREFIX."propal as t WHERE t.fk_soc = s.rowid AND t.fk_soc = ".$object->thirdparty->id),
+    			'order'=>array('enabled'=>$conf->commande->enabled, 'perms'=>1, 'label'=>'LinkToOrder', 'sql'=>"SELECT s.rowid as socid, s.nom as name, s.client, t.rowid, t.ref, t.ref_client, t.total_ht FROM ".MAIN_DB_PREFIX."societe as s, ".MAIN_DB_PREFIX."commande as t WHERE t.fk_soc = s.rowid AND t.fk_soc = ".$object->thirdparty->id),
+    			'invoice'=>array('enabled'=>$conf->facture->enabled, 'perms'=>1, 'label'=>'LinkToInvoice', 'sql'=>"SELECT s.rowid as socid, s.nom as name, s.client, t.rowid, t.facnumber as ref, t.ref_client, t.total as total_ht FROM ".MAIN_DB_PREFIX."societe as s, ".MAIN_DB_PREFIX."facture as t WHERE t.fk_soc = s.rowid AND t.fk_soc = ".$object->thirdparty->id),
+    			'contrat'=>array('enabled'=>$conf->contrat->enabled , 'perms'=>1, 'label'=>'LinkToContract', 'sql'=>"SELECT s.rowid as socid, s.nom as name, s.client, t.rowid, t.ref, t.ref_supplier, '' as total_ht FROM ".MAIN_DB_PREFIX."societe as s, ".MAIN_DB_PREFIX."contrat as t WHERE t.fk_soc = s.rowid AND t.fk_soc = ".$object->thirdparty->id),
+    			'fichinter'=>array('enabled'=>$conf->ficheinter->enabled, 'perms'=>1, 'label'=>'LinkToIntervention', 'sql'=>"SELECT s.rowid as socid, s.nom as name, s.client, t.rowid, t.ref FROM ".MAIN_DB_PREFIX."societe as s, ".MAIN_DB_PREFIX."fichinter as t WHERE t.fk_soc = s.rowid AND t.fk_soc = ".$object->thirdparty->id),
+    			'supplier_proposal'=>array('enabled'=>$conf->supplier_proposal->enabled , 'perms'=>1, 'label'=>'LinkToSupplierProposal', 'sql'=>"SELECT s.rowid as socid, s.nom as name, s.client, t.rowid, t.ref, '' as ref_supplier, t.total_ht FROM ".MAIN_DB_PREFIX."societe as s, ".MAIN_DB_PREFIX."supplier_proposal as t WHERE t.fk_soc = s.rowid AND t.fk_soc = ".$object->thirdparty->id),
+    			'order_supplier'=>array('enabled'=>$conf->fournisseur->commande->enabled , 'perms'=>1, 'label'=>'LinkToSupplierOrder', 'sql'=>"SELECT s.rowid as socid, s.nom as name, s.client, t.rowid, t.ref, t.ref_supplier, t.total_ht FROM ".MAIN_DB_PREFIX."societe as s, ".MAIN_DB_PREFIX."commande_fournisseur as t WHERE t.fk_soc = s.rowid AND t.fk_soc = ".$object->thirdparty->id),
+    			'invoice_supplier'=>array('enabled'=>$conf->fournisseur->facture->enabled , 'perms'=>1, 'label'=>'LinkToSupplierInvoice', 'sql'=>"SELECT s.rowid as socid, s.nom as name, s.client, t.rowid, t.ref, t.ref_supplier, t.total_ht FROM ".MAIN_DB_PREFIX."societe as s, ".MAIN_DB_PREFIX."facture_fourn as t WHERE t.fk_soc = s.rowid AND t.fk_soc = ".$object->thirdparty->id)
+    		);
+		}
+		
 		global $action;
 
-		// Can complet the possiblelink array
+		// Can complete the possiblelink array
 		$hookmanager->initHooks(array('commonobject'));
 		$parameters=array();
 		$reshook=$hookmanager->executeHooks('showLinkToObjectBlock',$parameters,$object,$action);    // Note that $action and $object may have been modified by hook