diff --git a/src/octoprint/server/util/flask.py b/src/octoprint/server/util/flask.py
index 1d0bbe6f..45317066 100644
--- a/src/octoprint/server/util/flask.py
+++ b/src/octoprint/server/util/flask.py
@@ -58,6 +58,8 @@ def passive_login():
 			logger = logging.getLogger(__name__)
 			logger.exception("Could not autologin user %s for networks %r" % (autologinAs, localNetworks))
 
+	return ("", 204)
+
 
 #~~ cache decorator for cacheable views
 
@@ -303,4 +305,4 @@ def get_json_command_from_request(request, valid_commands):
 		if not parameter in data:
 			return None, None, make_response("Mandatory parameter %s missing for command %s" % (parameter, command), 400)
 
-	return command, data, None
\ No newline at end of file
+	return command, data, None