diff --git a/src/ui/simple/CSimpleFrame.cpp b/src/ui/simple/CSimpleFrame.cpp
index 500772a..7630899 100644
--- a/src/ui/simple/CSimpleFrame.cpp
+++ b/src/ui/simple/CSimpleFrame.cpp
@@ -69,6 +69,7 @@ CSimpleFrame::~CSimpleFrame() {
     this->m_intAC = 3;
 
     this->m_top->UnregisterFrame(this);
+    this->m_top = nullptr;
 
     // TODO
 }