check section exist for group & conflict

src/main/kotlin/xyz/alexcrea/cuanvil/group/EnchantConflictManager.kt

@@ -48,6 +48,11 @@ class EnchantConflictManager {
 
     lateinit var conflictList: ArrayList<EnchantConflictGroup>
 
+
+    private fun warnBadKey(key: String) {
+        CustomAnvil.instance.logger.warning("Invalid key $key for conflict: is not a conflict")
+    }
+
     // Read and prepare all conflict
     fun prepareConflicts(config: ConfigurationSection, itemManager: ItemGroupManager) {
         conflictList = ArrayList()
@@ -59,7 +64,11 @@ class EnchantConflictManager {
 
         val keys = config.getKeys(false)
         for (key in keys) {
-            val section = config.getConfigurationSection(key)!!
+            val section = config.getConfigurationSection(key)
+            if(section == null) {
+                warnBadKey(key)
+                continue
+            }
             val conflict = createConflict(section, itemManager, key)
 
             addConflict(conflict)

src/main/kotlin/xyz/alexcrea/cuanvil/group/ItemGroupManager.kt

@@ -31,6 +31,8 @@ class ItemGroupManager {
         for (key in keys) {
             if (groupMap.containsKey(key))
                 continue
+            if (!config.isConfigurationSection(key))
+                continue
             createGroup(config, keys, key)
         }
     }
@@ -51,6 +53,7 @@ class ItemGroupManager {
         key: String
     ): AbstractMaterialGroup {
         val groupSection = config.getConfigurationSection(key)!!
+
         val groupType = groupSection.getString(GROUP_TYPE_PATH, null)
 
         // Create Material group according to the group type
@@ -105,11 +108,13 @@ class ItemGroupManager {
                 continue
             }
             // Get other group or create it if not yet created
-            val otherGroup = if (!groupMap.containsKey(groupName)) {
+            val otherGroup =
+            if (!groupMap.containsKey(groupName)) {
+                if(!config.isConfigurationSection(groupName)) continue
                 createGroup(config, keys, groupName)
-            } else {
-                groupMap[groupName]!!
             }
+            else groupMap[groupName]!!
+
             // Avoid self reference or it will create an infinite loop
             if (otherGroup.isReferencing(group)) {
                 CustomAnvil.instance.logger.warning(