diff --git a/bookscraper/scraper/tasks/audio_tasks.py b/bookscraper/scraper/tasks/audio_tasks.py
index f735516..fea3285 100644
--- a/bookscraper/scraper/tasks/audio_tasks.py
+++ b/bookscraper/scraper/tasks/audio_tasks.py
@@ -98,32 +98,34 @@ def generate_audio(
     # ============================================================
 
     container_path = chapter_text
-    # log(f"[AUDIO] CH{chapter_number}: container_path={container_path}")
 
-    # 1) Strip container prefix to get relative path: BOOK/VOLUME/FILE
-    if container_path.startswith(CONTAINER_PREFIX):
+    # Fix 1 — container_path kan None zijn → abort zonder crash
+    if not container_path:
+        log(f"[AUDIO] CH{chapter_number}: FATAL — no input path provided")
+        redis_client.delete(slot_key)
+        return
+
+    # Fix 2 — veilige startswith
+    if CONTAINER_PREFIX and container_path.startswith(CONTAINER_PREFIX):
         relative_path = container_path[len(CONTAINER_PREFIX) :].lstrip("/")
     else:
-        relative_path = container_path  # fallback
+        relative_path = container_path
 
     parts = relative_path.split("/")
     if len(parts) < 3:
         log(
             f"[AUDIO] CH{chapter_number}: FATAL — cannot parse book/volume from {relative_path}"
         )
-        if slot_key:
-            redis_client.delete(slot_key)
+        redis_client.delete(slot_key)
         return
 
     book_from_path = parts[0]
     volume_from_path = parts[1]
 
-    # 2) Construct real host path
     host_path = os.path.join(HOST_PATH, relative_path)
-    # log(f"[AUDIO] CH{chapter_number}: resolved_host_path={host_path}")
 
     # ============================================================
-    # PREPARE OUTPUT DIR  (always correct)
+    # OUTPUT PREP
     # ============================================================
 
     base_dir = os.path.join(HOST_PATH, book_from_path, volume_from_path, "Audio")
@@ -132,8 +134,6 @@ def generate_audio(
     safe_num = f"{chapter_number:04d}"
     audio_file = os.path.join(base_dir, f"{safe_num}.m4a")
 
-    # log(f"[AUDIO] CH{chapter_number}: output_file={audio_file}")
-
     if os.path.exists(audio_file):
         log(f"[AUDIO] Skip CH{chapter_number} → already exists")
         redis_client.delete(slot_key)
@@ -158,7 +158,6 @@ def generate_audio(
     # ============================================================
     # RUN TTS
     # ============================================================
-
     try:
         subprocess.run(cmd, shell=True, check=True, timeout=AUDIO_TIMEOUT)
         log(f"[AUDIO] CH{chapter_number}: Completed")