diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageTaskListener.java b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageTaskListener.java
index a841b7f96d3c5..c0a7c3f5e5dd6 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageTaskListener.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageTaskListener.java
@@ -259,9 +259,6 @@ class StageTaskListener implements ShellTaskOrganizer.TaskListener {
                 return;
             }
             sendStatusChanged();
-        } else {
-            throw new IllegalArgumentException(this + "\n Unknown task: " + taskInfo
-                    + "\n mRootTaskInfo: " + mRootTaskInfo);
         }
     }
 
diff --git a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/StageTaskListenerTests.java b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/StageTaskListenerTests.java
index 5ee8bf3006a30..b31e20fcc4389 100644
--- a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/StageTaskListenerTests.java
+++ b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/StageTaskListenerTests.java
@@ -126,12 +126,6 @@ public final class StageTaskListenerTests extends ShellTestCase {
         verify(mCallbacks).onStatusChanged(eq(mRootTask.isVisible), eq(true));
     }
 
-    @Test(expected = IllegalArgumentException.class)
-    public void testUnknownTaskVanished() {
-        final ActivityManager.RunningTaskInfo task = new TestRunningTaskInfoBuilder().build();
-        mStageTaskListener.onTaskVanished(task);
-    }
-
     @Test
     public void testTaskVanished() {
         // With shell transitions, the transition manages status changes, so skip this test.