diff --git a/artiq/compiler/embedding.py b/artiq/compiler/embedding.py
index e72adeee2..539e4ddad 100644
--- a/artiq/compiler/embedding.py
+++ b/artiq/compiler/embedding.py
@@ -751,7 +751,7 @@ class Stitcher:
     def _function_loc(self, function):
         if isinstance(function, SpecializedFunction):
             function = function.host_function
-        if hasattr(function, 'artiq_embedded'):
+        if hasattr(function, 'artiq_embedded') and function.artiq_embedded.function:
             function = function.artiq_embedded.function
 
         filename = function.__code__.co_filename