diff --git a/youtube_dl_webui/db.py b/youtube_dl_webui/db.py
index 080986c..0db74ae 100644
--- a/youtube_dl_webui/db.py
+++ b/youtube_dl_webui/db.py
@@ -186,7 +186,7 @@ def delete_task(self, tid):
         if row is None:
             raise TaskInexistenceError('')
 
-        dl_file = row['filename']
+        dl_file = row['filename'] if len(row['filename']) > 0 else None
 
         self.db.execute('DELETE FROM task_status WHERE tid=(?)', (tid, ))
         self.db.execute('DELETE FROM task_info WHERE tid=(?)', (tid, ))
diff --git a/youtube_dl_webui/task.py b/youtube_dl_webui/task.py
index 6329054..47e41db 100644
--- a/youtube_dl_webui/task.py
+++ b/youtube_dl_webui/task.py
@@ -211,7 +211,7 @@ def delete_task(self, tid, del_file=False):
         except TaskInexistenceError as e:
             raise TaskInexistenceError(e.msg)
 
-        if del_file and dl_file is not None:
+        if del_file and dl_file is not None and len(dl_file) > 0:
             file_wo_ext, ext = dl_file, None
             while ext != '':
                 file_wo_ext, ext = os.path.splitext(file_wo_ext)