diff --git a/script/local.py b/script/local.py
index 9593f947..35f9eedc 100644
--- a/script/local.py
+++ b/script/local.py
@@ -61,6 +61,8 @@ class ImageEnergyDistribution(ReadableCalibratedArray):
 
     def getCalibration(self):    
         c=Scienta.readImageDescriptor().calibration
+        if c is None:
+            return None
         return ArrayCalibration(c.scaleX, c.offsetX)
 
 EnergyDistribution = ImageEnergyDistribution()
@@ -76,6 +78,8 @@ class ImageAngleDistribution(ReadableCalibratedArray):
 
     def getCalibration(self):    
         c=Scienta.readImageDescriptor().calibration
+        if c is None:
+            return None
         return ArrayCalibration(c.scaleY, c.offsetY)
 
 AngleDistribution = ImageAngleDistribution()