diff --git a/Utilities/bin_patch.cpp b/Utilities/bin_patch.cpp
index 56caa585c1..887095707e 100644
--- a/Utilities/bin_patch.cpp
+++ b/Utilities/bin_patch.cpp
@@ -330,6 +330,12 @@ bool patch_engine::load(patch_map& patches_map, const std::string& path, std::st
 							is_valid = false;
 							continue;
 						}
+						else if (serial.size() != 9 || !std::all_of(serial.begin(), serial.end(), [](char c) { return std::isalnum(c); }))
+						{
+							append_log_message(log_messages, fmt::format("Error: Serial '%s' invalid (patch: %s, key: %s, location: %s, file: %s)", serial, description, main_key, get_yaml_node_location(serial_node), path), &patch_log.error);
+							is_valid = false;
+							continue;
+						}
 
 						if (const auto yml_type = serial_node.second.Type(); yml_type != YAML::NodeType::Sequence)
 						{