diff --git a/src/ui/CSimpleSlider.cpp b/src/ui/CSimpleSlider.cpp
index 935d242..cdf497b 100644
--- a/src/ui/CSimpleSlider.cpp
+++ b/src/ui/CSimpleSlider.cpp
@@ -326,3 +326,11 @@ float CSimpleSlider::Sub96BC10(float value) {
     // TODO
     return value;
 }
+
+void CSimpleSlider::UnregisterRegion(CSimpleRegion* region) {
+    if (this->m_thumbTexture == region) {
+        this->m_thumbTexture = nullptr;
+    }
+
+    this->CSimpleFrame::UnregisterRegion(region);
+}
diff --git a/src/ui/CSimpleSlider.hpp b/src/ui/CSimpleSlider.hpp
index be522f7..c2dce62 100644
--- a/src/ui/CSimpleSlider.hpp
+++ b/src/ui/CSimpleSlider.hpp
@@ -33,6 +33,7 @@ class CSimpleSlider : public CSimpleFrame {
         virtual bool IsA(int32_t type);
         virtual int32_t GetScriptMetaTable();
         virtual void LoadXML(XMLNode* node, CStatus* status);
+        virtual void UnregisterRegion(CSimpleRegion* region);
         virtual void OnLayerHide();
         virtual void OnLayerUpdate(float elapsedSec);
         virtual int32_t OnLayerTrackUpdate(const CMouseEvent& evt);