2 files changed, 9 insertions, 1 deletions
diff --git a/indra/llui/llfloater.cpp b/indra/llui/llfloater.cpp
index 39a6855273..22d6f6ca52 100644
--- a/indra/llui/llfloater.cpp
+++ b/indra/llui/llfloater.cpp
@@ -451,6 +451,14 @@ void LLFloater::enableResizeCtrls(bool enable)
 	}
 }
 
+void LLFloater::destroy()
+{
+	// LLFloaterReg should be synchronized with "dead" floater to avoid returning dead instance before
+	// it was deleted via LLMortician::updateClass(). See EXT-8458.
+	LLFloaterReg::removeInstance(mInstanceName, mKey);
+	die();
+}
+
 // virtual
 LLFloater::~LLFloater()
 {
diff --git a/indra/llui/llfloater.h b/indra/llui/llfloater.h
index 3ea035777c..42f422f91c 100644
--- a/indra/llui/llfloater.h
+++ b/indra/llui/llfloater.h
@@ -308,7 +308,7 @@ protected:
 	BOOL			getAutoFocus() const { return mAutoFocus; }
 	LLDragHandle*	getDragHandle() const { return mDragHandle; }
 
-	void			destroy() { die(); } // Don't call this directly.  You probably want to call closeFloater()
+	void			destroy(); // Don't call this directly.  You probably want to call closeFloater()
 
 	virtual	void	onClickCloseBtn();