diff --git a/crates/border-wars/src/responsive_scale.rs b/crates/border-wars/src/responsive_scale.rs
index dbca623..f35f335 100644
--- a/crates/border-wars/src/responsive_scale.rs
+++ b/crates/border-wars/src/responsive_scale.rs
@@ -29,6 +29,9 @@ pub fn change_scaling(
     size: Res<UILayoutSize>,
 ) {
     let window = windows.get_single().expect("Main window not found");
+    if window.resolution.physical_height() <= 0 {
+        return;
+    };
     let (a, b) = (
         window.resolution.width() / size.0.x,
         window.resolution.height() / size.0.y,