diff --git a/crates/core/src/node/debug.rs b/crates/core/src/node/debug.rs
index 344b6f1a..2fe812b1 100644
--- a/crates/core/src/node/debug.rs
+++ b/crates/core/src/node/debug.rs
@@ -89,7 +89,7 @@ impl InMemoryNode {
 
         let allow_no_target = system_contracts.evm_emulator.is_some();
         let mut l2_tx = L2Tx::from_request(request.into(), MAX_TX_SIZE, allow_no_target)
-            .map_err(|err| Web3Error::SerializationError(err))?;
+            .map_err(Web3Error::SerializationError)?;
         let execution_mode = zksync_multivm::interface::TxExecutionMode::EthCall;
         let storage = StorageView::new(&inner.fork_storage).into_rc_ptr();
 
diff --git a/crates/core/src/node/eth.rs b/crates/core/src/node/eth.rs
index 6428573f..e6a99934 100644
--- a/crates/core/src/node/eth.rs
+++ b/crates/core/src/node/eth.rs
@@ -475,27 +475,24 @@ impl InMemoryNode {
                     }
                 })
         }
-        Ok(self
-            .write_inner()?
+        self.write_inner()?
             .filters
             .add_log_filter(from_block, to_block, addresses, topics)
-            .map_err(anyhow::Error::msg)?)
+            .map_err(anyhow::Error::msg)
     }
 
     pub async fn new_block_filter_impl(&self) -> anyhow::Result<U256> {
-        Ok(self
-            .write_inner()?
+        self.write_inner()?
             .filters
             .add_block_filter()
-            .map_err(anyhow::Error::msg)?)
+            .map_err(anyhow::Error::msg)
     }
 
     pub async fn new_pending_transaction_filter_impl(&self) -> anyhow::Result<U256> {
-        Ok(self
-            .write_inner()?
+        self.write_inner()?
             .filters
             .add_pending_transaction_filter()
-            .map_err(anyhow::Error::msg)?)
+            .map_err(anyhow::Error::msg)
     }
 
     pub async fn uninstall_filter_impl(&self, id: U256) -> anyhow::Result<bool> {
@@ -568,11 +565,10 @@ impl InMemoryNode {
     }
 
     pub async fn get_filter_changes_impl(&self, id: U256) -> anyhow::Result<FilterChanges> {
-        Ok(self
-            .write_inner()?
+        self.write_inner()?
             .filters
             .get_new_changes(id)
-            .map_err(anyhow::Error::msg)?)
+            .map_err(anyhow::Error::msg)
     }
 
     pub async fn get_block_transaction_count_by_number_impl(
diff --git a/crates/core/src/node/in_memory.rs b/crates/core/src/node/in_memory.rs
index 95fe3d8e..f469ec0f 100644
--- a/crates/core/src/node/in_memory.rs
+++ b/crates/core/src/node/in_memory.rs
@@ -502,7 +502,7 @@ impl InMemoryNodeInner {
             MAX_TX_SIZE,
             allow_no_target,
         )
-        .map_err(|err| Web3Error::SerializationError(err))?;
+        .map_err(Web3Error::SerializationError)?;
 
         let tx: Transaction = l2_tx.clone().into();