diff --git a/src/com/android/settings/wifi/details/WifiDetailPreferenceController.java b/src/com/android/settings/wifi/details/WifiDetailPreferenceController.java
index f98dc589579..dfb59d19787 100644
--- a/src/com/android/settings/wifi/details/WifiDetailPreferenceController.java
+++ b/src/com/android/settings/wifi/details/WifiDetailPreferenceController.java
@@ -1109,6 +1109,10 @@ public class WifiDetailPreferenceController extends AbstractPreferenceController
             }
             @Override
             public void onFinish() {
+                if (mFragment == null || mFragment.getActivity() == null) {
+                    Log.d(TAG, "Ignore timeout since activity not exist!");
+                    return;
+                }
                 Log.e(TAG, "Timeout for state:" + mConnectingState);
                 if (mConnectingState == STATE_ENABLE_WIFI) {
                     updateConnectingState(STATE_ENABLE_WIFI_FAILED);
diff --git a/tests/robotests/src/com/android/settings/wifi/details/WifiDetailPreferenceControllerTest.java b/tests/robotests/src/com/android/settings/wifi/details/WifiDetailPreferenceControllerTest.java
index d4ce481e005..3ffe61a7729 100644
--- a/tests/robotests/src/com/android/settings/wifi/details/WifiDetailPreferenceControllerTest.java
+++ b/tests/robotests/src/com/android/settings/wifi/details/WifiDetailPreferenceControllerTest.java
@@ -1623,6 +1623,39 @@ public class WifiDetailPreferenceControllerTest {
                 mContext.getString(R.string.wifi_failed_connect_message));
     }
 
+    @Test
+    public void testConnectButton_clickConnectAndBackKey_ignoreTimeoutEvent() {
+        setUpForDisconnectedNetwork();
+        when(mockWifiManager.isWifiEnabled()).thenReturn(true);
+        InOrder inOrder = inOrder(mockButtonsPref);
+        setUpForToast();
+
+        displayAndResume();
+
+        // check connect button exist
+        verifyConnectBtnSetUpAsVisible(inOrder);
+
+        // click connect button
+        mController.connectNetwork();
+
+        // check display button as connecting
+        verify(mockWifiManager, times(1)).connect(anyInt(), any(WifiManager.ActionListener.class));
+        verifyConnectBtnSetUpAsConnecting(inOrder);
+
+        // leave detail page
+        when(mockFragment.getActivity()).thenReturn(null);
+
+        // timeout happened
+        mController.mTimer.onFinish();
+
+        // check connect button visible, be init as default and toast failed message
+        inOrder.verify(mockButtonsPref, never()).setButton3Text(R.string.wifi_connect);
+        inOrder.verify(mockButtonsPref, never()).setButton3Icon(R.drawable.ic_settings_wireless);
+        inOrder.verify(mockButtonsPref, never()).setButton3Enabled(true);
+        inOrder.verify(mockButtonsPref, never()).setButton3Visible(true);
+        assertThat(ShadowToast.shownToastCount()).isEqualTo(0);
+    }
+
     @Test
     public void updateAccessPoint_returnFalseForNothingChanged() {
         setUpForDisconnectedNetwork();