diff --git a/lib/transaction.py b/lib/transaction.py
index ae0c609b3..f0632cfaf 100644
--- a/lib/transaction.py
+++ b/lib/transaction.py
@@ -481,7 +481,7 @@ class Transaction:
         return self.raw
 
     def __init__(self, raw):
-        self.raw = raw.strip()
+        self.raw = raw.strip() if raw else None
         self.inputs = None
 
     def update(self, raw):