diff --git a/CHANGELOG.md b/CHANGELOG.md
index f0d973b6..8ffb9f61 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 ## Version 3
 
+### 3.8.2
+
+- Fixed a bug: the popover on upcoming relay switch could not appear in some cases.
+  - In case a postponed switch is configured for PRINTING_STARTED or PRINTING_STOPPED event, but no switch is
+    configured to happen immediately, the UI did not have an update.
+  - Thanks to [@backupartist](https://github.com/backupartist) for reporting and elaborating to fix this issue.
+
 ### 3.8.1
 
 - A couple fixes for the upcoming switch popover:
diff --git a/octoprint_octorelay/__init__.py b/octoprint_octorelay/__init__.py
index 7c22f9f2..f68f559b 100755
--- a/octoprint_octorelay/__init__.py
+++ b/octoprint_octorelay/__init__.py
@@ -202,6 +202,7 @@ def handle_plugin_event(self, event, scope = RELAY_INDEXES):
                         self.tasks.append(task)
                         task.timer.start()
                         self._logger.debug(f"The task registered: {task}")
+                        self.update_ui() # issue 190
 
     def toggle_relay(self, index, target: Optional[bool] = None):
         settings = self._settings.get([index], merged=True) # expensive
diff --git a/tests/test_init.py b/tests/test_init.py
index 344020e3..4c0f503f 100644
--- a/tests/test_init.py
+++ b/tests/test_init.py
@@ -626,6 +626,7 @@ def test_handle_plugin_event(self):
             { "event": "STARTUP", "state": False, "expectedCall": True, "delay": 0 },
         ]
         for case in cases:
+            self.plugin_instance.update_ui = Mock()
             self.plugin_instance.cancel_tasks = Mock()
             self.plugin_instance.tasks = []
             utilMock.ResettableTimer.reset_mock()
@@ -652,6 +653,7 @@ def test_handle_plugin_event(self):
                         case["delay"], self.plugin_instance.toggle_relay, ["r8", case["state"]]
                     )
                     timerMock.start.assert_called_with()
+                    self.plugin_instance.update_ui.assert_called_with() # issue 190
                     self.assertEqual(len(self.plugin_instance.tasks), 8)
                     for index in range(0,8):
                         self.assertIsInstance(self.plugin_instance.tasks[index], Task)
@@ -664,6 +666,7 @@ def test_handle_plugin_event(self):
                 utilMock.ResettableTimer.assert_not_called()
                 timerMock.start.assert_not_called()
                 self.plugin_instance.toggle_relay.assert_not_called()
+                self.plugin_instance.update_ui.assert_not_called()
 
     def test_cancel_tasks(self):
         # Should remove the tasks for the certain relay and cancel its timer