diff --git a/src/services/evm/crawl_evm_proxy_history.service.ts b/src/services/evm/crawl_evm_proxy_history.service.ts
index 2920371e0..e94ca7126 100644
--- a/src/services/evm/crawl_evm_proxy_history.service.ts
+++ b/src/services/evm/crawl_evm_proxy_history.service.ts
@@ -151,7 +151,7 @@ export default class CrawlProxyContractEVMService extends BullableService {
     newProxyHistories.forEach((proxyHistory) => {
       if (
         proxyHistory.implementation_contract !== null &&
-        foundContractsInDB[proxyHistory.proxy_contract] !== null
+        foundContractsInDB[proxyHistory.proxy_contract] !== undefined
       ) {
         newProxyContractsToSave.push(proxyHistory);
       } else {