diff --git a/pymodbus/transaction.py b/pymodbus/transaction.py
index 04dcce829..3e328bebe 100644
--- a/pymodbus/transaction.py
+++ b/pymodbus/transaction.py
@@ -451,7 +451,7 @@ def getTransaction(self, tid):
 
         """
         Log.debug("Getting transaction {}", tid)
-        if not tid:
+        if tid is None:
             if self.transactions:
                 return self.transactions.popitem()[1]
             return None