diff --git a/utils/srt.py b/utils/srt.py
index c4de755..fa8ed0f 100644
--- a/utils/srt.py
+++ b/utils/srt.py
@@ -473,6 +473,8 @@ def parse_txt(self, data: dict) -> None:
 
         original_data = json.loads(data)
 
+        self.speakers.add("UNKNOWN")
+
         if not original_data.get("segments"):
             return