diff --git a/ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/transactions/sorter/AbstractPendingTransactionsSorter.java b/ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/transactions/sorter/AbstractPendingTransactionsSorter.java
index b936e3ce25a..83424ae22fd 100644
--- a/ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/transactions/sorter/AbstractPendingTransactionsSorter.java
+++ b/ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/transactions/sorter/AbstractPendingTransactionsSorter.java
@@ -541,7 +541,9 @@ public List<Transaction> signalInvalidAndGetDependentTransactions(final Transact
 
   @Override
   public void signalInvalidAndRemoveDependentTransactions(final Transaction transaction) {
-    signalInvalidAndGetDependentTransactions(transaction).forEach(this::removeTransaction);
+    synchronized (lock) {
+      signalInvalidAndGetDependentTransactions(transaction).forEach(this::removeTransaction);
+    }
   }
 
   @Override