diff --git a/services/core/java/com/android/server/wm/AppWindowContainerController.java b/services/core/java/com/android/server/wm/AppWindowContainerController.java
index bde2111..292734d 100644
--- a/services/core/java/com/android/server/wm/AppWindowContainerController.java
+++ b/services/core/java/com/android/server/wm/AppWindowContainerController.java
@@ -470,6 +470,13 @@
                 return false;
             }
 
+            final WindowState mainWin = mContainer.findMainWindow();
+            if (mainWin != null && mainWin.isVisible() && mainWin.isDrawnLw()) {
+                // App already has a visible window that is drawn...why would you want a starting
+                // window?
+                return false;
+            }
+
             final int type = getStartingWindowType(newTask, taskSwitch, processRunning,
                     allowTaskSnapshot);