diff --git a/script/test/MultiplePlot.py b/script/test/MultiplePlot.py
index 6b1ed73..b2ccde4 100644
--- a/script/test/MultiplePlot.py
+++ b/script/test/MultiplePlot.py
@@ -1,14 +1,17 @@
 import random
 
 title = "test"
+p = None
 def add_plot(x,y, name=None):
+    global title
+    global p
     plots = get_plots(title = title)
     if len(plots)==0:
         p = plot(None,name="Data 1")[0]        
         p.setLegendVisible(True)
     else:
         p = plots[0]    
-        p.addSeries(LinePlotSeries(name))        
+        p.addSeries(LinePlotSeries(name))            
     s = p.getSeries(name)
     s.setData(x, y)