diff --git a/log10/load.py b/log10/load.py
index 3d3e93b1..95f401b5 100644
--- a/log10/load.py
+++ b/log10/load.py
@@ -705,7 +705,11 @@ def wrapper(*args, **kwargs):
                     while result_queue.empty():
                         pass
                     result = result_queue.get()
-                    completionID = result["completionID"]
+
+                    if result is None:
+                        return output
+
+                    completionID = result.get("completionID")
                     last_completion_response_var.set(result)
 
             with timed_block("result call duration (sync)"):
diff --git a/tests/large_image.png b/tests/large_image.png
new file mode 100644
index 00000000..9fc22bbb
Binary files /dev/null and b/tests/large_image.png differ
diff --git a/tests/test_magentic.py b/tests/test_magentic.py
index 4c8ed701..ab77d61e 100644
--- a/tests/test_magentic.py
+++ b/tests/test_magentic.py
@@ -2,7 +2,17 @@
 
 import openai
 import pytest
-from magentic import AsyncParallelFunctionCall, AsyncStreamedStr, FunctionCall, OpenaiChatModel, StreamedStr, prompt
+from magentic import (
+    AsyncParallelFunctionCall,
+    AsyncStreamedStr,
+    FunctionCall,
+    OpenaiChatModel,
+    StreamedStr,
+    SystemMessage,
+    chatprompt,
+    prompt,
+)
+from magentic.vision import UserImageMessage
 from pydantic import BaseModel
 
 from log10._httpx_utils import finalize
@@ -176,3 +186,16 @@ async def _generate_title_and_description(query: str, widget_data: str) -> Widge
     _LogAssertion(
         completion_id=session.last_completion_id(), function_args=function_args
     ).assert_function_call_response()
+
+
+@pytest.mark.async_client
+@pytest.mark.widget
+@pytest.mark.asyncio(scope="module")
+async def test_large_image_upload(session, magentic_model):
+    with open("./tests/large_image.png", "rb") as f:
+        image_bytes = f.read()
+
+    @chatprompt(SystemMessage("What's in the following screenshot?"), UserImageMessage(image_bytes))
+    def _llm() -> str: ...
+
+    _llm()