diff --git a/src/processor.ts b/src/processor.ts
index 0550d63..325ef3e 100644
--- a/src/processor.ts
+++ b/src/processor.ts
@@ -8,6 +8,7 @@ import {
     Transaction as _Transaction,
 } from '@subsquid/evm-processor'
 import * as friendTechAbi from './abi/friendTechAbi'
+import { assertNotNull } from '@subsquid/util-internal'
 
 export const FRIENDTECH_CONTRACT = '0xCF205808Ed36593aa40a44F10c7f7C2F67d4A4d4'.toLowerCase()
 
@@ -15,7 +16,7 @@ export const processor = new EvmBatchProcessor()
     .setDataSource({
         archive: lookupArchive('base-mainnet'),
         chain: {
-            url: process.env.RPC_BASE_HTTP,
+            url: assertNotNull(process.env.RPC_BASE_HTTP),
             rateLimit: 10,
         }
     })