diff --git a/nms/nms-common/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/gui/ExternGuiTester.kt b/nms/nms-common/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/gui/ExternGuiTester.kt
deleted file mode 100644
index 8b06b10..0000000
--- a/nms/nms-common/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/gui/ExternGuiTester.kt
+++ /dev/null
@@ -1,16 +0,0 @@
-package xyz.alexcrea.cuanvil.dependency.gui
-
-import org.bukkit.inventory.InventoryView
-
-interface ExternGuiTester {
-
-    fun getContainerClass(view: InventoryView): Class<Any>?
-
-    fun testIfGui(inventory: InventoryView): Boolean {
-        // container class only allow default bukkit craft view or test class
-
-        val clazz = getContainerClass(inventory)
-        return clazz == null
-    }
-
-}
\ No newline at end of file
diff --git a/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/DependencyManager.kt b/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/DependencyManager.kt
index 66a9aa5..9c8c159 100644
--- a/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/DependencyManager.kt
+++ b/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/DependencyManager.kt
@@ -16,7 +16,7 @@ import xyz.alexcrea.cuanvil.api.event.listener.CAPreAnvilBypassEvent
 import xyz.alexcrea.cuanvil.api.event.listener.CATreatAnvilResultEvent
 import xyz.alexcrea.cuanvil.config.ConfigHolder
 import xyz.alexcrea.cuanvil.dependency.datapack.DataPackDependency
-import xyz.alexcrea.cuanvil.dependency.gui.ExternGuiTester
+import xyz.alexcrea.cuanvil.dependency.gui.GenericExternGuiTester
 import xyz.alexcrea.cuanvil.dependency.gui.GuiTesterSelector
 import xyz.alexcrea.cuanvil.dependency.packet.PacketManager
 import xyz.alexcrea.cuanvil.dependency.packet.PacketManagerSelector
@@ -34,7 +34,7 @@ object DependencyManager {
 
     lateinit var scheduler: TaskScheduler
     lateinit var packetManager: PacketManager
-    var externGuiTester: ExternGuiTester? = null
+    var externGuiTester: GenericExternGuiTester? = null
 
     var enchantmentSquaredCompatibility: EnchantmentSquaredDependency? = null
     var ecoEnchantCompatibility: EcoEnchantDependency? = null
diff --git a/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/gui/GenericExternGuiTester.kt b/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/gui/GenericExternGuiTester.kt
index 4ff3354..0e430ef 100644
--- a/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/gui/GenericExternGuiTester.kt
+++ b/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/gui/GenericExternGuiTester.kt
@@ -1,14 +1,18 @@
 package xyz.alexcrea.cuanvil.dependency.gui
 
 import org.bukkit.inventory.InventoryView
+import xyz.alexcrea.cuanvil.dependency.MinecraftVersionUtil
+import xyz.alexcrea.cuanvil.dependency.util.PlatformUtil
 import java.lang.reflect.Method
 
-class GenericExternGuiTester: ExternGuiTester {
+class GenericExternGuiTester {
 
     companion object {
         private const val ANVIL_CLASS_NAME = "org.bukkit.craftbukkit.inventory.view.CraftAnvilView"
         private const val INV_CLASS_NAME = "org.bukkit.craftbukkit.inventory.CraftInventoryView"
         private const val HANDLE_METHOD_NAME = "getHandle"
+
+        private const val CANONICAL_PAPER_ANVIL_MENU = "net.minecraft.world.inventory.AnvilMenu"
     }
 
     var testExist = false
@@ -17,11 +21,7 @@ class GenericExternGuiTester: ExternGuiTester {
     var testedClass: String? = null
     lateinit var getHandleMethod: Method
 
-    override fun getContainerClass(view: InventoryView): Class<Any>? {
-        // In case we are in a test environment
-        if(!testExist) testClassExist()
-        if(inTesting) return view.javaClass //TEMPORARY
-
+    private fun getContainerClass(view: InventoryView): Class<Any>? {
         if(!testedClass.contentEquals(view.javaClass.name))
             return null
 
@@ -58,4 +58,50 @@ class GenericExternGuiTester: ExternGuiTester {
         inTesting = true
     }
 
+    // Try if were in another plugin anvil inventory
+    fun testIfGui(inventory: InventoryView): Boolean {
+        // In case we are in a test environment
+        if(!testExist) testClassExist()
+        if(inTesting) return false
+
+        val clazz = getContainerClass(inventory) ?: return false
+
+        val clazzName = clazz.name
+        if(!PlatformUtil.isPaper){
+            // Blacklist gui causing issue
+            if (expectWesjd(clazzName)) return true
+            if (expectXenondevUI(clazzName)) return true
+            if (expectVanePortal(clazzName)) return true
+
+            return false
+        }
+
+        // Only allow cannonical anvil menu class
+        return !CANONICAL_PAPER_ANVIL_MENU.equals(clazzName, true)
+    }
+
+    // Known custom implementations
+    fun expectWesjd(name: String): Boolean {
+        val expectedWesjdGuiPath = "anvilgui.version.Wrapper${MinecraftVersionUtil.craftbukkitVersion}"
+
+        return name.contains(expectedWesjdGuiPath)
+    }
+
+    private val XenondevUIPrefix: String
+        get() = "xyz.xenondevs.inventoryaccess."
+    private val XenondevUISufix: String
+        get() = ".AnvilInventoryImpl"
+
+    fun expectXenondevUI(name: String): Boolean {
+        return name.startsWith(XenondevUIPrefix)
+                && name.endsWith(XenondevUISufix)
+    }
+
+    fun expectVanePortal(name: String): Boolean {
+        val expected = "org.oddlama.vane.core.menu.AnvilMenu\$AnvilContainer"
+
+        return name == expected
+    }
+
+
 }
\ No newline at end of file
diff --git a/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/gui/GuiTesterSelector.kt b/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/gui/GuiTesterSelector.kt
index f64a7f1..e445d8d 100644
--- a/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/gui/GuiTesterSelector.kt
+++ b/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/gui/GuiTesterSelector.kt
@@ -4,7 +4,7 @@ import xyz.alexcrea.cuanvil.update.UpdateUtils
 
 object GuiTesterSelector {
 
-    val selectGuiTester: ExternGuiTester?
+    val selectGuiTester: GenericExternGuiTester?
         get() {
             val versionParts = UpdateUtils.currentMinecraftVersionArray()
             if (versionParts[0] != 1) return null