diff --git a/silkworm/rpc/commands/erigon_api.cpp b/silkworm/rpc/commands/erigon_api.cpp
index 176fedd0c3..4cb4188e9d 100644
--- a/silkworm/rpc/commands/erigon_api.cpp
+++ b/silkworm/rpc/commands/erigon_api.cpp
@@ -256,6 +256,8 @@ Task<void> ErigonRpcApi::handle_erigon_get_header_by_hash(const nlohmann::json&
         } else {
             reply = make_json_content(request, *header);
         }
+    } catch (const std::invalid_argument& iv) {
+        reply = make_json_error(request, kServerError, "block header not found: 0x" + silkworm::to_hex(block_hash));
     } catch (const std::exception& e) {
         SILK_ERROR << "exception: " << e.what() << " processing request: " << request.dump();
         reply = make_json_error(request, kInternalError, e.what());
@@ -423,6 +425,8 @@ Task<void> ErigonRpcApi::handle_erigon_get_logs_by_hash(const nlohmann::json& re
         SILK_DEBUG << "logs.size(): " << logs.size();
 
         reply = make_json_content(request, logs);
+    } catch (const std::invalid_argument& iv) {
+        reply = make_json_content(request, nullptr);
     } catch (const std::exception& e) {
         SILK_ERROR << "exception: " << e.what() << " processing request: " << request.dump();
         reply = make_json_error(request, kInternalError, e.what());
diff --git a/silkworm/rpc/commands/eth_api.cpp b/silkworm/rpc/commands/eth_api.cpp
index 25cb2093c9..c74b36a0d0 100644
--- a/silkworm/rpc/commands/eth_api.cpp
+++ b/silkworm/rpc/commands/eth_api.cpp
@@ -464,6 +464,8 @@ Task<void> EthereumRpcApi::handle_eth_get_uncle_count_by_block_hash(const nlohma
             const auto ommers = block_with_hash->block.ommers.size();
             reply = make_json_content(request, to_quantity(ommers));
         }
+    } catch (const std::invalid_argument& iv) {
+        reply = make_json_content(request, nullptr);
     } catch (const std::exception& e) {
         SILK_ERROR << "exception: " << e.what() << " processing request: " << request.dump();
         reply = make_json_error(request, kInternalError, e.what());