fix

Author: Zoran Cvetkov

tests/tests/integration_tests.rs

@@ -863,13 +863,15 @@ async fn test_subgraph_grafting(ctx: TestContext) -> anyhow::Result<()> {
             proofOfIndexing(
               subgraph: $subgraph,
               blockNumber: $blockNumber,
-              blockHash: $blockHash
+              blockHash: $blockHash,
+              indexer: $indexer
             ) } "#;
 
         let vars = json!({
             "subgraph": subgraph.deployment,
             "blockNumber": i,
             "blockHash": block_hash,
+            "indexer": "0x0000000000000000000000000000000000000000"
         });
         let resp = Subgraph::query_with_vars(FETCH_POI, vars).await?;
         assert_eq!(None, resp.get("errors"));