diff --git a/app/managers.py b/app/managers.py
index 0844575966611d69ba4e267449ff85d1d42ac529..be93c2cd4d5abbfb029393c641fa2ad9eee8242a 100644
--- a/app/managers.py
+++ b/app/managers.py
@@ -61,6 +61,8 @@ class TimestampManager(models.Manager):
     def stamp(proof_hash, file_hash):
 
         contract = TimestampManager.get_current_contract()
+        
+        web3 = TimestampManager.get_provider()
 
         return contract.functions.stamp(proof_hash, file_hash).transact({'from': Web3.toChecksumAddress(ACCOUNT_ADDRESS), 'gas': GAS, 'gasPrice': web3.eth.gasPrice})