diff --git a/htdocs/projet/card.php b/htdocs/projet/card.php
index 432fc888d65..091d20c24d6 100644
--- a/htdocs/projet/card.php
+++ b/htdocs/projet/card.php
@@ -1006,13 +1006,13 @@ if ($action == 'create' && $user->rights->projet->creer) {
 		$morehtmlref .= dol_escape_htmltag($object->title);
 		// Thirdparty
 		$morehtmlref .= '<br>'.$langs->trans('ThirdParty').' : ';
-		if ($object->thirdparty->id > 0) {
+		if (!empty($object->thirdparty->id) && $object->thirdparty->id > 0) {
 			$morehtmlref .= $object->thirdparty->getNomUrl(1, 'project');
 		}
 		$morehtmlref .= '</div>';
 
 		// Define a complementary filter for search of next/prev ref.
-		if (!$user->rights->projet->all->lire) {
+		if (empty($user->rights->projet->all->lire)) {
 			$objectsListId = $object->getProjectsAuthorizedForUser($user, 0, 0);
 			$object->next_prev_filter = " rowid IN (".$db->sanitize(count($objectsListId) ? join(',', array_keys($objectsListId)) : '0').")";
 		}
diff --git a/htdocs/projet/contact.php b/htdocs/projet/contact.php
index 68d12df3bcd..48f12e23ec4 100644
--- a/htdocs/projet/contact.php
+++ b/htdocs/projet/contact.php
@@ -294,13 +294,13 @@ if ($id > 0 || !empty($ref)) {
 	// Title
 	$morehtmlref .= $object->title;
 	// Thirdparty
-	if ($object->thirdparty->id > 0) {
+	if (!empty($object->thirdparty->id) && $object->thirdparty->id > 0) {
 		$morehtmlref .= '<br>'.$langs->trans('ThirdParty').' : '.$object->thirdparty->getNomUrl(1, 'project');
 	}
 	$morehtmlref .= '</div>';
 
 	// Define a complementary filter for search of next/prev ref.
-	if (!$user->rights->projet->all->lire) {
+	if (empty($user->rights->projet->all->lire)) {
 		$objectsListId = $object->getProjectsAuthorizedForUser($user, 0, 0);
 		$object->next_prev_filter = " rowid IN (".$db->sanitize(count($objectsListId) ?join(',', array_keys($objectsListId)) : '0').")";
 	}
diff --git a/htdocs/projet/document.php b/htdocs/projet/document.php
index df31724d07c..9ac87b46084 100644
--- a/htdocs/projet/document.php
+++ b/htdocs/projet/document.php
@@ -134,7 +134,7 @@ if ($object->id > 0) {
 	// Title
 	$morehtmlref .= $object->title;
 	// Thirdparty
-	if ($object->thirdparty->id > 0) {
+	if (!empty($object->thirdparty->id) && $object->thirdparty->id > 0) {
 		$morehtmlref .= '<br>'.$langs->trans('ThirdParty').' : '.$object->thirdparty->getNomUrl(1, 'project');
 	}
 	$morehtmlref .= '</div>';
diff --git a/htdocs/projet/element.php b/htdocs/projet/element.php
index 252dafddb5d..66288159f39 100644
--- a/htdocs/projet/element.php
+++ b/htdocs/projet/element.php
@@ -164,7 +164,7 @@ if ($id == '' && $ref == '') {
 	exit();
 }
 
-$mine = $_REQUEST['mode'] == 'mine' ? 1 : 0;
+$mine = (!empty($_REQUEST['mode']) && $_REQUEST['mode'] == 'mine') ? 1 : 0;
 //if (! $user->rights->projet->all->lire) $mine=1;	// Special for projects
 
 $object = new Project($db);
@@ -216,13 +216,13 @@ $morehtmlref = '<div class="refidno">';
 // Title
 $morehtmlref .= $object->title;
 // Thirdparty
-if ($object->thirdparty->id > 0) {
+if (!empty($object->thirdparty->id) && $object->thirdparty->id > 0) {
 	$morehtmlref .= '<br>'.$langs->trans('ThirdParty').' : '.$object->thirdparty->getNomUrl(1, 'project');
 }
 $morehtmlref .= '</div>';
 
 // Define a complementary filter for search of next/prev ref.
-if (!$user->rights->projet->all->lire) {
+if (empty($user->rights->projet->all->lire)) {
 	$objectsListId = $object->getProjectsAuthorizedForUser($user, 0, 0);
 	$object->next_prev_filter = " te.rowid IN (".$db->sanitize(count($objectsListId) ?join(',', array_keys($objectsListId)) : '0').")";
 }
diff --git a/htdocs/projet/note.php b/htdocs/projet/note.php
index 9fee6615c40..3c32bd528a4 100644
--- a/htdocs/projet/note.php
+++ b/htdocs/projet/note.php
@@ -33,7 +33,7 @@ $action = GETPOST('action', 'aZ09');
 $id = GETPOST('id', 'int');
 $ref = GETPOST('ref', 'alpha');
 
-$mine = $_REQUEST['mode'] == 'mine' ? 1 : 0;
+$mine = (isset($_REQUEST['mode']) && $_REQUEST['mode'] == 'mine') ? 1 : 0;
 //if (! $user->rights->projet->all->lire) $mine=1;	// Special for projects
 
 $object = new Project($db);
@@ -100,7 +100,7 @@ if ($id > 0 || !empty($ref)) {
 	// Title
 	$morehtmlref .= $object->title;
 	// Thirdparty
-	if ($object->thirdparty->id > 0) {
+	if (!empty($object->thirdparty->id) && $object->thirdparty->id > 0) {
 		$morehtmlref .= '<br>'.$langs->trans('ThirdParty').' : '.$object->thirdparty->getNomUrl(1, 'project');
 	}
 	$morehtmlref .= '</div>';
diff --git a/htdocs/projet/tasks.php b/htdocs/projet/tasks.php
index 666f7d8343a..80d39cf08d4 100644
--- a/htdocs/projet/tasks.php
+++ b/htdocs/projet/tasks.php
@@ -550,13 +550,13 @@ if ($id > 0 || !empty($ref)) {
 	// Title
 	$morehtmlref .= $object->title;
 	// Thirdparty
-	if ($object->thirdparty->id > 0) {
+	if (!empty($object->thirdparty->id) && $object->thirdparty->id > 0) {
 		$morehtmlref .= '<br>'.$langs->trans('ThirdParty').' : '.$object->thirdparty->getNomUrl(1, 'project');
 	}
 	$morehtmlref .= '</div>';
 
 	// Define a complementary filter for search of next/prev ref.
-	if (!$user->rights->projet->all->lire) {
+	if (empty($user->rights->projet->all->lire)) {
 		$objectsListId = $object->getProjectsAuthorizedForUser($user, 0, 0);
 		$object->next_prev_filter = " rowid IN (".$db->sanitize(count($objectsListId) ?join(',', array_keys($objectsListId)) : '0').")";
 	}
diff --git a/htdocs/projet/tasks/time.php b/htdocs/projet/tasks/time.php
index d171d130a41..4bb5ab8e503 100644
--- a/htdocs/projet/tasks/time.php
+++ b/htdocs/projet/tasks/time.php
@@ -719,7 +719,7 @@ if (($id > 0 || !empty($ref)) || $projectidforalltimes > 0) {
 			$head = project_prepare_head($projectstatic);
 			print dol_get_fiche_head($head, $tab, $langs->trans("Project"), -1, ($projectstatic->public ? 'projectpub' : 'project'));
 
-			$param = ($mode == 'mine' ? '&mode=mine' : '');
+			$param = ((!empty($mode) && $mode == 'mine') ? '&mode=mine' : '');
 
 			// Project card
 
@@ -729,13 +729,13 @@ if (($id > 0 || !empty($ref)) || $projectidforalltimes > 0) {
 			// Title
 			$morehtmlref .= $projectstatic->title;
 			// Thirdparty
-			if ($projectstatic->thirdparty->id > 0) {
+			if (!empty($projectstatic->thirdparty->id) && $projectstatic->thirdparty->id > 0) {
 				$morehtmlref .= '<br>'.$langs->trans('ThirdParty').' : '.$projectstatic->thirdparty->getNomUrl(1, 'project');
 			}
 			$morehtmlref .= '</div>';
 
 			// Define a complementary filter for search of next/prev ref.
-			if (!$user->rights->projet->all->lire) {
+			if (empty($user->rights->projet->all->lire)) {
 				$objectsListId = $projectstatic->getProjectsAuthorizedForUser($user, 0, 0);
 				$projectstatic->next_prev_filter = " rowid IN (".$db->sanitize(count($objectsListId) ?join(',', array_keys($objectsListId)) : '0').")";
 			}