diff --git a/src/TranslationServer.py b/src/TranslationServer.py
index 6519efa..f0127cf 100644
--- a/src/TranslationServer.py
+++ b/src/TranslationServer.py
@@ -110,6 +110,7 @@ def translate():
 @check_run_mode
 def get_sign():
 	sign_name = request.args.get('name').encode("UTF-8").upper()
+	if " " in sign_name: abort(400)
 	sign_type = request.args.get('type').encode("UTF-8").upper()
 	return check_sign(sign_name, sign_type)
 
--
libgit2 0.21.2