diff --git a/src/TranslationServer.py b/src/TranslationServer.py
index 63ad8e7..440ea54 100644
--- a/src/TranslationServer.py
+++ b/src/TranslationServer.py
@@ -102,7 +102,7 @@ def update_platform_db(platform_name):
 	conn.commit()
 
 def check_sign(sign_name, sign_type):
-	if " " in sign_name: abort(400)
+	if " " in sign_name or sign_type not in BUNDLES_PATH: abort(400)
 	bundle_path = os.path.join(BUNDLES_PATH[sign_type], sign_name)
 	file_exists = os.path.exists(bundle_path)
 	if RUN_MODE == "full":
--
libgit2 0.21.2