diff --git a/NewHorizons/Builder/Props/Audio/SignalBuilder.cs b/NewHorizons/Builder/Props/Audio/SignalBuilder.cs
index e34c46f6..9fd8617c 100644
--- a/NewHorizons/Builder/Props/Audio/SignalBuilder.cs
+++ b/NewHorizons/Builder/Props/Audio/SignalBuilder.cs
@@ -141,6 +141,7 @@ namespace NewHorizons.Builder.Props.Audio
 
         public static string GetCustomSignalName(SignalName signalName)
         {
+            if (_customSignalNames == null) return string.Empty;
             _customSignalNames.TryGetValue(signalName, out string name);
             return name;
         }