Directory should be created in the system before saving in the DB.

main/inc/lib/fileUpload.lib.php

@@ -1518,19 +1518,21 @@ function create_unexisting_directory(
     }
 
     if (!is_dir($base_work_dir.$systemFolderName)) {
-        mkdir(
+        $result = mkdir(
             $base_work_dir.$systemFolderName,
             api_get_permissions_for_new_directories(),
             true
         );
 
+        if ($result) {
+
             // Check if pathname already exists inside document table
             $tbl_document = Database::get_course_table(TABLE_DOCUMENT);
             $sql = "SELECT id, path FROM $tbl_document
                     WHERE
                         c_id = $course_id AND
                         (
-		                path = '".$systemFolderName."'
+                            path = '" . $systemFolderName . "'
                         )
             ";
 
@@ -1584,15 +1586,15 @@ function create_unexisting_directory(
                             $session_id
                         );
                     }
+
                     $documentData = DocumentManager::get_document_data_by_id(
                         $document_id,
                         $_course['code'],
                         false,
                         $session_id
                     );
+
                     return $documentData;
-            } else {
-                return false;
                 }
             } else {
                 $document = Database::fetch_array($rs);
@@ -1608,10 +1610,10 @@ function create_unexisting_directory(
 
                 return $documentData;
             }
-    } else {
+        }
+    }
 
     return false;
-    }
 }
 
 /**