diff --git a/lsp_bridge.py b/lsp_bridge.py
index 40aade5a26..4f9459d415 100755
--- a/lsp_bridge.py
+++ b/lsp_bridge.py
@@ -990,7 +990,7 @@ def read_lang_server_info(lang_server_path):
 
 def load_single_server_info(lang_server):
     lang_server_info_path = ""
-    if os.path.exists(lang_server) and os.path.dirname(lang_server) != "":
+    if isinstance(lang_server, str) and os.path.exists(lang_server) and os.path.dirname(lang_server) != "":
         # If lang_server is real file path, we load the LSP server configuration from the user specified file.
         lang_server_info_path = lang_server
     else: