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XF 1.2 Error in Watched Forum Function

Hi Guys,

When i Click on "Watched Forum" function in my account preferences (personal details), i got this error message:


An exception occurred: Invalid argument supplied for foreach() in <path>/library/XenForo/ViewPublic/Watched/Forums.php on line 21

  1. XenForo_Application::handlePhpError() in XenForo/ViewPublic/Watched/Forums.php at line 21
  2. XenForo_ViewPublic_Watched_Forums->renderHtml() in XenForo/ViewRenderer/Abstract.php at line 227
  3. XenForo_ViewRenderer_Abstract->renderViewObject() in XenForo/ViewRenderer/HtmlPublic.php at line 67
  4. XenForo_ViewRenderer_HtmlPublic->renderView() in XenForo/FrontController.php at line 572
  5. XenForo_FrontController->renderView() in XenForo/FrontController.php at line 158
  6. XenForo_FrontController->run() in <path>/index.php at line 13
Anyone know why this error happened?