diff --git a/shared/java/Window.java b/shared/java/Window.java
index e8520d21..e2e5c635 100644
--- a/shared/java/Window.java
+++ b/shared/java/Window.java
@@ -421,7 +421,9 @@ public void accept(Event e) {
                 _layer.reconfigure();
             } else if (e instanceof EventWindowResize) {
                 EventWindowResize ee = (EventWindowResize) e;
-                _layer.resize(ee.getContentWidth(), ee.getContentHeight());
+                if (ee.getContentWidth()>=0 && ee.getContentWidth()>=0) {
+                    _layer.resize(ee.getContentWidth(), ee.getContentHeight());
+                }
             } else if (e instanceof EventFrame) {
                 _layer.frame();
             }