diff --git a/eth_portfolio/_loaders/token_transfer.py b/eth_portfolio/_loaders/token_transfer.py
index eb95ab30..e7904981 100644
--- a/eth_portfolio/_loaders/token_transfer.py
+++ b/eth_portfolio/_loaders/token_transfer.py
@@ -103,6 +103,9 @@ async def load_token_transfer(
             else:
                 coro_results["transaction_index"] = await tx_index_coro
 
+            if coro_results["transaction_index"] is None:
+                raise TypeError(None, coro_results, transfer_log)
+                
         except Exception as e:
             logger.error(
                 f"%s %s for %s %s at block %s:",