From 124f11455eaf17088938f0167091d233c61582d6 Mon Sep 17 00:00:00 2001
From: Yash Mandaviya <yash.mandaviya@fundmore.ai>
Date: Sun, 14 Jun 2026 16:43:11 -0400
Subject: [PATCH] fix: handle None ABI in process_log and process_receipt
 methods - fixes #1648

---
 .../contracts/test_extracting_event_data.py   | 27 +++++++++++++++++++
 web3/contract/base_contract.py                |  4 +--
 2 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/tests/core/contracts/test_extracting_event_data.py b/tests/core/contracts/test_extracting_event_data.py
index 30fcea0c64..f72f29a24f 100644
--- a/tests/core/contracts/test_extracting_event_data.py
+++ b/tests/core/contracts/test_extracting_event_data.py
@@ -1332,3 +1332,30 @@ def test_receipt_processing_catches_insufficientdatabytes_error_by_default(
     with pytest.raises(InsufficientDataBytes):
         returned_log = event_instance.process_receipt(txn_receipt_dict, errors=STRICT)
         assert len(returned_log) == 0
+
+
+def test_process_log_with_abi_not_set(w3, emitter, wait_for_transaction):
+    # process_log should not crash when .abi is None
+    txn_hash = emitter.functions.logListArgs([b"13"], [b"54"]).transact()
+    txn_receipt = wait_for_transaction(w3, txn_hash)
+
+    event_instance = emitter.events.LogListArgs
+
+    # .abi can be None if the event is accessed without proper initialization
+    event_instance.abi = None
+
+    rich_log = event_instance.process_log(txn_receipt["logs"][0])
+    assert rich_log["event"] == "LogListArgs"
+
+
+def test_process_receipt_with_abi_not_set(w3, emitter, wait_for_transaction):
+    # process_receipt should not crash when .abi is None
+    txn_hash = emitter.functions.logListArgs([b"13"], [b"54"]).transact()
+    txn_receipt = wait_for_transaction(w3, txn_hash)
+
+    event_instance = emitter.events.LogListArgs
+    event_instance.abi = None
+
+    processed_logs = event_instance.process_receipt(txn_receipt)
+    assert len(processed_logs) == 1
+    assert processed_logs[0]["event"] == "LogListArgs"
diff --git a/web3/contract/base_contract.py b/web3/contract/base_contract.py
index 37b9980932..018210cd87 100644
--- a/web3/contract/base_contract.py
+++ b/web3/contract/base_contract.py
@@ -241,7 +241,7 @@ def _parse_logs(
 
         for log in txn_receipt["logs"]:
             try:
-                rich_log = get_event_data(self.w3.codec, self.abi, log)
+                rich_log = get_event_data(self.w3.codec, self._get_event_abi(), log)
             except (
                 MismatchedABI,
                 LogTopicError,
@@ -271,7 +271,7 @@ def _parse_logs(
 
     @combomethod
     def process_log(self, log: LogReceipt) -> EventData:
-        return get_event_data(self.w3.codec, self.abi, log)
+        return get_event_data(self.w3.codec, self._get_event_abi(), log)
 
     @combomethod
     def _get_event_filter_params(