diff --git a/src/p_setup.cpp b/src/p_setup.cpp
index 0c902bd2f9..346a2a5cb0 100644
--- a/src/p_setup.cpp
+++ b/src/p_setup.cpp
@@ -366,8 +366,8 @@ void FLevelLocals::ClearLevelData()
 	localEventManager->Shutdown();
 	if (aabbTree) delete aabbTree;
 	aabbTree = nullptr;
-	screen->SetAABBTree(nullptr);
-
+	if (screen)
+		screen->SetAABBTree(nullptr);
 }
 
 //==========================================================================