diff --git a/fm_eventmanager/file_storage.py b/fm_eventmanager/file_storage.py
index deccfc06..4cb9eab9 100644
--- a/fm_eventmanager/file_storage.py
+++ b/fm_eventmanager/file_storage.py
@@ -2,12 +2,14 @@
 
 
 def _is_excluded(name: str) -> bool:
-    return name.startswith("bundler/")
+    return name.startswith("bundler/") or name.endswith(".map")
 
 
 class SelectiveManifestStaticFilesStorage(ManifestStaticFilesStorage):
     def hashed_name(self, name, content=None, filename=None):
-        if _is_excluded(name):
+        if _is_excluded(name) or (filename and _is_excluded(filename)):
             return name
-        else:
+        try:
             return super().hashed_name(name, content, filename)
+        except ValueError:
+            return name