diff --git a/Python_script/MeasurementPlot.py b/Python_script/MeasurementPlot.py
index 16ccd5525eeaf0cffac9f224743804670d9e70c1..b9d616e011600be1afdeb05c3394ad37f379286e 100644
--- a/Python_script/MeasurementPlot.py
+++ b/Python_script/MeasurementPlot.py
@@ -88,6 +88,8 @@ class MeasurementPlot:
     @staticmethod
     def get_extended_min_max(array):
         distance = array.max() - array.min()
+        if distance == 0.:
+            distance = 0.5
         return array.min()-0.05*distance, array.max()+0.05*distance
 
 if __name__ == '__main__':