diff --git a/script/Alignment/Gun_solenoid_alignment.py b/script/Alignment/Gun_solenoid_alignment.py
index 329e21b..0ef53c1 100755
--- a/script/Alignment/Gun_solenoid_alignment.py
+++ b/script/Alignment/Gun_solenoid_alignment.py
@@ -94,6 +94,7 @@ def ar():
 r = None
 if not multiple_background:
     laser_on()
+try:    
     sensors =  [camtool.com_x, camtool.com_y] 
     if plot_image:
         sensors.append(camtool.image)