diff --git a/Project_Model/Libs/BPE/Classes/NanoSocratesBPE.py b/Project_Model/Libs/BPE/Classes/NanoSocratesBPE.py
index d517f04..a74412d 100644
--- a/Project_Model/Libs/BPE/Classes/NanoSocratesBPE.py
+++ b/Project_Model/Libs/BPE/Classes/NanoSocratesBPE.py
@@ -162,7 +162,11 @@ class NanoSocratesBPE(Encoder):
 
             # in this case there was a candidate token to substitute the couple of element
             NEW_PIECE.append(CANDIDATE_TOKEN)
-            index += 2
+
+            index += 1
+            if index == PIECE_LENGTH:
+                    NEW_PIECE.append(piece[index])
+            index += 1
 
         return NEW_PIECE