diff --git a/htdocs/core/lib/files.lib.php b/htdocs/core/lib/files.lib.php
index 2ed990205ad69..ee9b55b21c3d4 100644
--- a/htdocs/core/lib/files.lib.php
+++ b/htdocs/core/lib/files.lib.php
@@ -1448,6 +1448,7 @@ function dol_delete_file($file, $disableglob = 0, $nophperrors = 0, $nohook = 0,
 					}
 				}
 			} else {
+				$ok = false; // to avoid false positive
 				dol_syslog("No files to delete found", LOG_DEBUG);
 			}
 		} else {
diff --git a/htdocs/projet/tasks/task.php b/htdocs/projet/tasks/task.php
index b8ff5a6f9bc48..4f1ca11848bc4 100644
--- a/htdocs/projet/tasks/task.php
+++ b/htdocs/projet/tasks/task.php
@@ -65,7 +65,10 @@
 }
 
 if ($id > 0 || $ref) {
-	$object->fetch($id, $ref);
+	$ret = $object->fetch($id, $ref);
+	if ($ret > 0) {
+		$projectstatic->fetch($object->fk_project);
+	}
 }
 
 // Security check
@@ -204,14 +207,14 @@
 	require_once DOL_DOCUMENT_ROOT.'/core/lib/files.lib.php';
 
 	$langs->load("other");
-	$upload_dir = $conf->project->dir_output;
+	$upload_dir = $conf->project->dir_output."/".dol_sanitizeFileName($projectstatic->ref)."/".dol_sanitizeFileName($object->ref);
 	$file = $upload_dir.'/'.dol_sanitizeFileName(GETPOST('file'));
 
 	$ret = dol_delete_file($file);
 	if ($ret) {
-		setEventMessages($langs->trans("FileWasRemoved", GETPOST('urlfile')), null, 'mesgs');
+		setEventMessages($langs->trans("FileWasRemoved", GETPOST('file')), null, 'mesgs');
 	} else {
-		setEventMessages($langs->trans("ErrorFailToDeleteFile", GETPOST('urlfile')), null, 'errors');
+		setEventMessages($langs->trans("ErrorFailToDeleteFile", GETPOST('file')), null, 'errors');
 	}
 }
 
@@ -222,7 +225,6 @@
 $form = new Form($db);
 $formother = new FormOther($db);
 $formfile = new FormFile($db);
-$result = $projectstatic->fetch($object->fk_project);
 
 $title = $object->ref;
 if (!empty($withproject)) {
@@ -692,7 +694,7 @@
 		/*
 		 * Generated documents
 		 */
-		$filename = dol_sanitizeFileName($projectstatic->ref)."/".dol_sanitizeFileName($object->ref);
+		$filename = '';
 		$filedir = $conf->project->dir_output."/".dol_sanitizeFileName($projectstatic->ref)."/".dol_sanitizeFileName($object->ref);
 		$urlsource = $_SERVER["PHP_SELF"]."?id=".$object->id;
 		$genallowed = ($user->rights->projet->lire);