From 7b7c5f932e50c06aa261da79108ee67f28a8ec4c Mon Sep 17 00:00:00 2001
From: Joe Knapper <jaknapper@hotmail.com>
Date: Wed, 8 Jul 2026 14:05:01 +0100
Subject: [PATCH] Convert log to string for fallback server

---
 src/openflexure_microscope_server/server/__init__.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/openflexure_microscope_server/server/__init__.py b/src/openflexure_microscope_server/server/__init__.py
index 2e1849bf..e9fa24bd 100644
--- a/src/openflexure_microscope_server/server/__init__.py
+++ b/src/openflexure_microscope_server/server/__init__.py
@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import json
 import logging
 import os
 from argparse import Namespace
@@ -150,7 +151,8 @@ def serve_from_cli(argv: Optional[list[str]] = None) -> None:
             print(f"Error: {e}")  # noqa: T201
             print("Starting fallback server.")  # noqa: T201
             try:
-                log_history = OFM_HANDLER.log_history
+                # The log is a list of dicts, fallback server expects a string
+                log_history = json.dumps(OFM_HANDLER.log_history, indent=2)
             except BaseException:
                 # If log history fails for any reason carry on.
                 log_history = None