diff --git a/src/Moves.py b/src/Moves.py
index 33e2514f968e0aed4e3754a1d2587e7baa6466f6..4dfc036bb0a85dd58318a321d0ab1200f2f708ce 100644
--- a/src/Moves.py
+++ b/src/Moves.py
@@ -19,8 +19,9 @@ class Moves:
         if(mvtType == 'ROOT'):   return 2
         labelCode = self.dicoLabels.getCode(mvtLabel)
         if not labelCode :
-            print("cannot compute code of movement ", mvt, "label ", mvtLabel, "unknown")
-            exit(1)
+            labelCode = self.dicoLabels.getCode('NULL')
+            #print("cannot compute code of movement ", mvt, "label ", mvtLabel, "unknown")
+            #exit(1)
         if(mvtType == 'RIGHT'):  return 3 + 2 * labelCode
         if(mvtType == 'LEFT'):   return 3 + 2 * labelCode + 1