diff --git a/tools/releasetools/sign_target_files_apks.py b/tools/releasetools/sign_target_files_apks.py
index 04b627b..4cb3a37 100755
--- a/tools/releasetools/sign_target_files_apks.py
+++ b/tools/releasetools/sign_target_files_apks.py
@@ -188,6 +188,9 @@
   for apex, key in OPTIONS.extra_apex_payload_keys.items():
     if not key:
       key = 'PRESIGNED'
+    if apex not in keys_info:
+      logger.warning('Failed to find %s in target_files; Ignored', apex)
+      continue
     keys_info[apex] = (key, keys_info[apex][1])
 
   # Apply the key remapping to container keys.