diff --git a/src/Add-on/KJLImport.ts b/src/Add-on/KJLImport.ts
index 62ffe47b5..95f7d692f 100644
--- a/src/Add-on/KJLImport.ts
+++ b/src/Add-on/KJLImport.ts
@@ -296,6 +296,8 @@ function ParseCabNameMap(data: KJL_AssemblyModel[]): Map<string, string>
 async function ParseMaterialMap(config: { [key: string]: KJLImportConfigOption; })
 {
     let map = new Map<string, KJL_Material>();
+    if (!config) return map;
+
     for (const mtl of config.option.materials)
     {
         let material_id = mtl.id;
@@ -563,7 +565,7 @@ async function ParseModel(model: KJL_ParamModel, roomName: string, gName: string
         if (parentMatrix)
             mtx.premultiply(parentMatrix);
 
-        if (config.option.isImportVirtualModel)
+        if (!config || config.option.isImportVirtualModel)
         {
             let hmodel = model as KJL_ParamModel_Hardware;
             let hw = CreateHardware(hmodel, roomName, gName);