diff --git a/blockchain.py b/blockchain.py
index d3e7580..43f1ce1 100644
--- a/blockchain.py
+++ b/blockchain.py
@@ -139,6 +139,7 @@ class Block:
             return
         balances = prev_block.balances.copy()
         balances.setdefault(self.miner_pubkey, 0)
+        balances.setdefault(t.receiver, 0)
         balances[self.miner_pubkey] += 100
         t = self.transaction
         if t is not None: