From 88647962f4ed543ff689f0ed53b6bb604324db3e Mon Sep 17 00:00:00 2001
From: Joel Collins <joel@jtcollins.net>
Date: Tue, 4 Dec 2018 15:15:09 +0000
Subject: [PATCH] Closing microscope checks if hardware is attached

---
 openflexure_microscope/microscope.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/openflexure_microscope/microscope.py b/openflexure_microscope/microscope.py
index fb35dcd9..ed1c19d8 100644
--- a/openflexure_microscope/microscope.py
+++ b/openflexure_microscope/microscope.py
@@ -42,8 +42,10 @@ class Microscope(object):
 
     def close(self):
         """Shut down the microscope hardware."""
-        self.camera.close()
-        self.stage.close()
+        if self.camera:
+            self.camera.close()
+        if self.stage:
+            self.stage.close()
 
     def attach(self, camera: StreamingCamera, stage: OpenFlexureStage, apply_config: bool=True):
         """