diff --git a/fastapi/_compat.py b/fastapi/_compat.py
index a4b305d42..df7541316 100644
--- a/fastapi/_compat.py
+++ b/fastapi/_compat.py
@@ -623,7 +623,8 @@ def is_uploadfile_sequence_annotation(annotation: Any) -> bool:
                 at_least_one = True
                 continue
         return at_least_one
-    return field_annotation_is_sequence(annotation) and all(
+    args = get_args(annotation)
+    return field_annotation_is_sequence(annotation) and args and all(
         is_uploadfile_or_nonable_uploadfile_annotation(sub_annotation)
-        for sub_annotation in get_args(annotation)
+        for sub_annotation in args
     )