diff --git a/evm_loader/lib/src/rpc/validator_client.rs b/evm_loader/lib/src/rpc/validator_client.rs
index e62860be1..d912a472f 100644
--- a/evm_loader/lib/src/rpc/validator_client.rs
+++ b/evm_loader/lib/src/rpc/validator_client.rs
@@ -115,6 +115,7 @@ impl Deref for CloneRpcClient {
 #[async_trait(?Send)]
 impl Rpc for CloneRpcClient {
     async fn get_last_deployed_slot(&self, _program_id: &Pubkey) -> ClientResult<Option<u64>> {
+        // Update event impossible during CloneRpcClient work. Returns always 0 for caching.
         Ok(Some(0))
     }
     async fn get_account_slice(
diff --git a/evm_loader/lib/src/types/programs_cache.rs b/evm_loader/lib/src/types/programs_cache.rs
index d99c57450..a72a9fbef 100644
--- a/evm_loader/lib/src/types/programs_cache.rs
+++ b/evm_loader/lib/src/types/programs_cache.rs
@@ -48,14 +48,14 @@ where
     fn get(&self, key: &KeyAccountCache) -> Option<Value> {
         self.table
             .read()
-            .expect("acc_hash_get_instance poisoned")
+            .expect("lock on read error ")
             .get(key)
             .cloned()
     }
     fn add(&self, key: KeyAccountCache, value: Value) {
         self.table
             .write()
-            .expect("PANIC, no space ")
+            .expect("lock on write error  ")
             .insert(key, value);
     }
 }