From afb45595f3c6e81101c611133cd2eca9ba613671 Mon Sep 17 00:00:00 2001
From: Ishaan Jaff <ishaanjaffer0324@gmail.com>
Date: Fri, 6 Mar 2026 18:09:34 -0800
Subject: [PATCH] Apply suggestion from @greptile-apps[bot]

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>
---
 litellm/proxy/proxy_server.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/litellm/proxy/proxy_server.py b/litellm/proxy/proxy_server.py
index 5b98ba50e69..30a85769461 100644
--- a/litellm/proxy/proxy_server.py
+++ b/litellm/proxy/proxy_server.py
@@ -772,6 +772,10 @@ async def proxy_startup_event(app: FastAPI):  # noqa: PLR0915
             if not _hook_spec:
                 continue
             try:
+                if ":" not in _hook_spec:
+                    raise ValueError(
+                        f"Invalid hook spec '{_hook_spec}': expected format is 'module.path:function_name'"
+                    )
                 _module_path, _func_name = _hook_spec.rsplit(":", 1)
                 _module = importlib.import_module(_module_path)
                 _hook_fn = getattr(_module, _func_name)