diff --git a/code/beginner/tutorial4-buffer/src/main.rs b/code/beginner/tutorial4-buffer/src/main.rs
index f434b5a8..ec5168e8 100644
--- a/code/beginner/tutorial4-buffer/src/main.rs
+++ b/code/beginner/tutorial4-buffer/src/main.rs
@@ -190,13 +190,15 @@ impl State {
         }
     }
 
-    fn resize(&mut self, new_size: winit::dpi::PhysicalSize<u32>) {
-        self.size = new_size;
-        self.sc_desc.width = new_size.width;
-        self.sc_desc.height = new_size.height;
-        self.swap_chain = self.device.create_swap_chain(&self.surface, &self.sc_desc);
+    pub fn resize(&mut self, new_size: winit::dpi::PhysicalSize<u32>) {
+        if new_size.width > 0 && new_size.height > 0 {
+            self.size = new_size;
+            self.sc_desc.width = new_size.width;
+            self.sc_desc.height = new_size.height;
+            self.swap_chain = self.device.create_swap_chain(&self.surface, &self.sc_desc);
+        }
     }
-
+    
     #[allow(unused_variables)]
     fn input(&mut self, event: &WindowEvent) -> bool {
         false