From 7064e9a1371181ba066e8d6fc43e703b55f593be Mon Sep 17 00:00:00 2001
From: sunce86 <dusan.stanivukovic@gmail.com>
Date: Wed, 4 May 2022 18:28:23 +0200
Subject: [PATCH] fix priority access list estimator

---
 crates/solver/src/settlement_access_list.rs | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/crates/solver/src/settlement_access_list.rs b/crates/solver/src/settlement_access_list.rs
index 19d8e11df8..efc83f4e20 100644
--- a/crates/solver/src/settlement_access_list.rs
+++ b/crates/solver/src/settlement_access_list.rs
@@ -242,10 +242,14 @@ impl AccessListEstimating for PriorityAccessListEstimating {
         for (i, estimator) in self.estimators.iter().enumerate() {
             match estimator.estimate_access_lists(txs).await {
                 Ok(result) => {
-                    return Ok(result
-                        .into_iter()
-                        .map(|access_list| access_list.map(filter_access_list))
-                        .collect())
+                    // result is valid if access list exist for at least one of the transactions
+                    let is_valid = result.iter().any(|access_list| access_list.is_ok());
+                    if is_valid {
+                        return Ok(result
+                            .into_iter()
+                            .map(|access_list| access_list.map(filter_access_list))
+                            .collect());
+                    }
                 }
                 Err(err) => {
                     tracing::warn!("access list estimator {} failed {:?}", i, err);