diff --git a/FlippR-Driver/src/output/factories/LampFactory.cpp b/FlippR-Driver/src/output/factories/LampFactory.cpp
index dc0bf0b..1a8639d 100644
--- a/FlippR-Driver/src/output/factories/LampFactory.cpp
+++ b/FlippR-Driver/src/output/factories/LampFactory.cpp
@@ -61,8 +61,12 @@ void LampFactory::set_address_pins()
 uint8_t LampFactory::get_address_pin(nlohmann::json & pin_object)
 {
   auto address = pin_object.at(config_path::item_address).get<uint8_t>();
-  auto extender = pin_object.at(config_path::item_extender).get<std::string>();
-  auto pin_base = this->get_extender_pin_base(extender);
+  uint8_t pin_base = 0;
+  if (pin_object.find(config_path::item_extender) != pin_object.end())
+  {
+    auto extender = pin_object.at(config_path::item_extender).get<std::string>();
+    pin_base = this->get_extender_pin_base(extender);
+  }
 
   return address + pin_base;
 }