From 14cc3f9fcfd683aa3fe35cc1aefc868d64c03153 Mon Sep 17 00:00:00 2001
From: Julian Stirling <julian@julianstirling.co.uk>
Date: Sun, 21 Sep 2025 16:50:04 +0100
Subject: [PATCH] Fix error trying to purge empty scans if current scan has no
 images

Closes #563
---
 src/openflexure_microscope_server/things/smart_scan.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/openflexure_microscope_server/things/smart_scan.py b/src/openflexure_microscope_server/things/smart_scan.py
index 1b760e13..59ff87dc 100644
--- a/src/openflexure_microscope_server/things/smart_scan.py
+++ b/src/openflexure_microscope_server/things/smart_scan.py
@@ -179,6 +179,9 @@ class SmartScanThing(lt.Thing):
             # Ensure any PreviewStitcher created cannot be reused.
             self._preview_stitcher = None
 
+        # Remove any scan folders containing zero images.
+        self.purge_empty_scans(logger=logger)
+
     @_scan_running
     def _check_background_and_csm_set(self) -> None:
         """Before starting a scan, check that background and camera-stage-mapping are set.
@@ -386,9 +389,6 @@ class SmartScanThing(lt.Thing):
         self._return_to_starting_position()
         self._perform_final_stitch()
 
-        # Remove any scan folders containing zero images
-        self.purge_empty_scans(logger=self._scan_logger)
-
     @_scan_running
     def _main_scan_loop(self) -> None:
         """Run the main loop of the scan.