Update: the same errors are displayed on the front end when the values are unset.
Notice: Undefined index: show_excerpt in …\\plugins\wti-like-post\wti_like_post_widgets.php on line 238
Notice: Undefined index: show_thumbnail in …\\plugins\wti-like-post\wti_like_post_widgets.php on line 239
Notice: Undefined index: show_categories in …\\plugins\wti-like-post\wti_like_post_widgets.php on line 240
Notice: Undefined index: show_tags in …\\plugins\wti-like-post\wti_like_post_widgets.php on line 241
Notice: Undefined index: show_author in …\\plugins\wti-like-post\wti_like_post_widgets.php on line 242
Notice: Undefined variable: hour in …\\plugins\wti-like-post\wti_like_post.php on line 776
Notice: Undefined variable: day in …\\plugins\wti-like-post\wti_like_post.php on line 777
Notice: Undefined variable: year in …\\plugins\wti-like-post\wti_like_post.php on line 777