diff --git a/FilterExtension/Core.cs b/FilterExtension/Core.cs
index 39965785..7c47ef67 100644
--- a/FilterExtension/Core.cs
+++ b/FilterExtension/Core.cs
@@ -42,8 +42,8 @@ public class Core : MonoBehaviour
         public bool debug = false;
         public bool setAdvanced = true;
         public bool replaceFbM = true;
-        public string categoryDefault;
-        public string subCategoryDefault;
+        public string categoryDefault = "";
+        public string subCategoryDefault = "";
 
         const string fallbackIcon = "stockIcon_fallback";
 
diff --git a/FilterExtension/Utility/PartType.cs b/FilterExtension/Utility/PartType.cs
index c84a4b4b..71d28028 100644
--- a/FilterExtension/Utility/PartType.cs
+++ b/FilterExtension/Utility/PartType.cs
@@ -21,7 +21,7 @@ public static bool checkSubcategory(AvailablePart part, string value, int depth)
             foreach (string s in value.Split(',').Select(str => str.Trim()))
             {
                 FilterExtensions.ConfigNodes.customSubCategory subcategory;
-                if (Core.Instance.subCategoriesDict.TryGetValue(s, out subcategory) && subcategory.checkFilters(part, depth))
+                if (Core.Instance.subCategoriesDict.TryGetValue(s, out subcategory) && subcategory.checkFilters(part, depth + 1))
                     return true;
             }
             return false;
@@ -90,7 +90,6 @@ public static bool checkCategory(AvailablePart part, string value)
                         break;
                 }
             }
-
             return false;
         }
 
diff --git a/GameData/000_FilterExtensions/FilterExtensions.dll b/GameData/000_FilterExtensions/FilterExtensions.dll
index f0b57300..5d4ed8ad 100644
Binary files a/GameData/000_FilterExtensions/FilterExtensions.dll and b/GameData/000_FilterExtensions/FilterExtensions.dll differ