diff --git a/backend/services/face_analysis.py b/backend/services/face_analysis.py
index 8eb6e0b..17fe762 100644
--- a/backend/services/face_analysis.py
+++ b/backend/services/face_analysis.py
@@ -305,7 +305,7 @@ def _confidence_for(speaker: str, cluster_index: int) -> int:
                 speaker_mappings[top_2[1]] = 1 - speaker_mappings[top_2[0]]
 
         # Extra speakers → dominant speaker's cluster
-        dominant_idx = speaker_mappings.get(speakers_by_talk[0], 0)
+        dominant_idx = speaker_mappings.get(speakers_by_talk[0], 0) if speakers_by_talk else 0
         for sp in speakers_by_talk[2:]:
             speaker_mappings[sp] = dominant_idx
     elif len(clusters_list) >= 2 and len(speakers) >= 2:
diff --git a/backend/services/transcription.py b/backend/services/transcription.py
index 3dde47d..69f7493 100644
--- a/backend/services/transcription.py
+++ b/backend/services/transcription.py
@@ -9,6 +9,7 @@
 
 import os
 import subprocess
+import sys
 import tempfile
 from typing import Optional, Callable