From 358a0451285feb585f12f76735375bc3cec963f3 Mon Sep 17 00:00:00 2001
From: Corebit <123189979+corebit-nl@users.noreply.github.com>
Date: Sat, 22 Nov 2025 11:22:59 +0100
Subject: [PATCH] Fallback on background callback function names if source
 cannot be found

---
 dash/background_callback/managers/__init__.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/dash/background_callback/managers/__init__.py b/dash/background_callback/managers/__init__.py
index 6bea3765d3..4145f27f63 100644
--- a/dash/background_callback/managers/__init__.py
+++ b/dash/background_callback/managers/__init__.py
@@ -56,7 +56,11 @@ def get_updated_props(self, key):
         raise NotImplementedError
 
     def build_cache_key(self, fn, args, cache_args_to_ignore, triggered):
-        fn_source = inspect.getsource(fn)
+        try:
+            fn_source = inspect.getsource(fn)
+            fn_str = fn_source
+        except OSError:  # pylint: disable=too-broad-exception
+            fn_str = getattr(fn, "__name__", "")
 
         if not isinstance(cache_args_to_ignore, (list, tuple)):
             cache_args_to_ignore = [cache_args_to_ignore]
@@ -69,7 +73,7 @@ def build_cache_key(self, fn, args, cache_args_to_ignore, triggered):
                     arg for i, arg in enumerate(args) if i not in cache_args_to_ignore
                 ]
 
-        hash_dict = dict(args=args, fn_source=fn_source, triggered=triggered)
+        hash_dict = dict(args=args, fn_source=fn_str, triggered=triggered)
 
         if self.cache_by is not None:
             # Caching enabled