Got 502 error sometimes

Hello I got some error like 502 error sometimes.please check the error log:
[Sun Jun 09 11:15:39.420393 2019] [php7:notice] [pid 5767] [client 54.93.174.196:35746] All-in-One Event Calendar: unserialize(): Error at offset 185 of 216 bytes @ /nas/content/live/greattaste/wp-content/plugins/all-in-one-event-calendar/app/model/event.php:428 #8
[Sun Jun 09 11:15:39.630295 2019] [php7:notice] [pid 5767] [client 54.93.174.196:35746] All-in-One Event Calendar: unserialize(): Error at offset 185 of 216 bytes @ /nas/content/live/greattaste/wp-content/plugins/all-in-one-event-calendar/app/model/event.php:428 #8
[Sun Jun 09 21:33:56.830815 2019] [php7:notice] [pid 16125] [client 52.53.195.168:28486] WordPress database error You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘ wp_posts.post_title ASC, wp_postmeta.meta_value+0 ASC LIMIT 0, 20 /* From [www.’ at line 5 for query SELECT DISTINCT SQL_CALC_FOUND_ROWS wp_posts.* FROM wp_posts LEFT JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id) INNER JOIN wp_postmeta ON ( wp_posts.ID = wp_postmeta.post_id ) LEFT JOIN wp_term_relationships AS trel ON (wp_posts.ID = trel.object_id) LEFT JOIN wp_term_taxonomy AS ttax ON ( ( ttax.taxonomy = ‘category’ OR ttax.taxonomy = ‘post_tag’ OR ttax.taxonomy = ‘post_format’ OR ttax.taxonomy = ‘w2dc-category’ OR ttax.taxonomy = ‘w2dc-location’ OR ttax.taxonomy = ‘w2dc-tag’ OR ttax.taxonomy = ‘frm_tag’ OR ttax.taxonomy = ‘action-group’ OR ttax.taxonomy = ‘product_type’ OR ttax.taxonomy = ‘product_visibility’ OR ttax.taxonomy = ‘product_cat’ OR ttax.taxonomy = ‘product_tag’ OR ttax.taxonomy = ‘product_shipping_class’ OR ttax.taxonomy = ‘pa_author’ OR ttax.taxonomy = ‘pa_binding’ OR ttax.taxonomy = ‘pa_brand’ OR ttax.taxonomy = ‘pa_color’ OR ttax.taxonomy = ‘pa_manufacturer’ OR ttax.taxonomy = ‘pa_model’ OR ttax.taxonomy = ‘pa_size’ OR ttax.taxonomy = ‘promo_type’ OR ttax.taxonomy = ‘recipe_category’ OR ttax.taxonomy = ‘video_cat’ OR ttax.taxonomy = ‘gtmag_rstrnt’ OR ttax.taxonomy = ‘hot_shots’ OR ttax.taxonomy = ‘issues’ OR ttax.taxonomy = ‘gtmag_brunch’ OR ttax.taxonomy = ‘gtmag_happyhour’ OR ttax.taxonomy = ‘gtmag_bestof’ OR ttax.taxonomy = ‘post_month’ OR ttax.taxonomy = ‘events_categories’ OR ttax.taxonomy = ‘events_tags’ OR ttax.taxonomy = ‘events_feeds’ OR ttax.taxonomy = ‘events_venues’ ) AND trel.term_taxonomy_id = ttax.term_taxonomy_id) LEFT JOIN wp_terms AS tter ON (ttax.term_id = tter.term_id) LEFT JOIN wp_w2dc_levels_relationships AS w2dc_lr ON w2dc_lr.post_id = wp_posts.ID LEFT JOIN wp_w2dc_levels AS w2dc_levels ON w2dc_levels.id = w2dc_lr.level_id WHERE 1=1 AND ( ( wp_posts.ID IN (197222,197478,198291,198407,198988,199586,200232,201078,225674,247534,247549,274987,301787,309601,274947,199750,306359,354975,356725,360954,306361,200195,364865,366575,199912,303743,310568,199013,370286,353472,356718,360943,356724,225965,383973,385677,363946,353209,371730,247547,201076,197793,388350,275171) AND (((((wp_posts.post_title LIKE ‘%restaurant%’) OR (wp_posts.post_content LIKE ‘%restaurant%’))) OR ((tter.name LIKE ‘%restaurant%’)) OR ((tter.slug LIKE ‘%restaurant%’)) OR ((ttax.description LIKE ‘%restaurant%’)) )) AND ( \n wp_postmeta.meta_key = ‘_order_date’\n) AND wp_posts.post_type = ‘w2dc_listing’ AND ((wp_posts.post_status = ‘publish’))) AND post_type != ‘revision’) AND post_status != ‘future’ AND ( ( 1=1 AND ( \n wp_term_relationships.term_taxonomy_id IN (39721)\n) ) OR ( 1=1 AND (((wp_posts.post_title LIKE ‘%restaurant%’) OR (wp_posts.post_excerpt LIKE ‘%restaurant%’) OR (wp_posts.post_content LIKE ‘%restaurant%’))) AND (wp_posts.post_password = ”) ) ) GROUP BY wp_posts.ID ORDER BY w2dc_levels.sticky DESC, w2dc_levels.featured DESC, wp_posts.post_title LIKE ‘%Closed%’ ASC, wp_posts.post_type LIKE ‘w2dc_listing’ DESC, , wp_posts.post_title ASC, wp_postmeta.meta_value+0 ASC LIMIT 0, 20 /* From [www.great-taste.net/directory/?w2dc_action=search&controller=listings_controller&include_categories_children=1&directories=1&categories=&categories_text=&what_search=restaurant&location_id=&location_id_text=&address=92782&radius=0&use_advanced=0&submit=] in [/nas/content/live/greattaste/wp-content/plugins/codecanyon-6463373-web-20-directory-plugin-for-wordpress/classes/shortcodes/directory_controller.php:284] */ made by require(‘wp-blog-header.php’), wp, WP->main, do_action_ref_array(‘wp’), WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, w2dc_plugin->loadFrontendControllers, w2dc_plugin->loadNestedFrontendController, w2dc_plugin->loadNestedFrontendController, w2dc_plugin->loadNestedFrontendController, w2dc_directory_controller->init, WP_Query->__construct, WP_Query->query, WP_Query->get_posts, referer: https://www.great-taste.net/opening-soon/
[Sun Jun 09 21:34:20.385936 2019] [php7:notice] [pid 20604] [client 34.230.59.41:28964] WordPress database error You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘ wp_posts.post_title ASC, wp_postmeta.meta_value+0 ASC LIMIT 0, 20 /* From [www.’ at line 5 for query SELECT DISTINCT SQL_CALC_FOUND_ROWS wp_posts.* FROM wp_posts LEFT JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id) INNER JOIN wp_postmeta ON ( wp_posts.ID = wp_postmeta.post_id ) LEFT JOIN wp_term_relationships AS trel ON (wp_posts.ID = trel.object_id) LEFT JOIN wp_term_taxonomy AS ttax ON ( ( ttax.taxonomy = ‘category’ OR ttax.taxonomy = ‘post_tag’ OR ttax.taxonomy = ‘post_format’ OR ttax.taxonomy = ‘w2dc-category’ OR ttax.taxonomy = ‘w2dc-location’ OR ttax.taxonomy = ‘w2dc-tag’ OR ttax.taxonomy = ‘frm_tag’ OR ttax.taxonomy = ‘action-group’ OR ttax.taxonomy = ‘product_type’ OR ttax.taxonomy = ‘product_visibility’ OR ttax.taxonomy = ‘product_cat’ OR ttax.taxonomy = ‘product_tag’ OR ttax.taxonomy = ‘product_shipping_class’ OR ttax.taxonomy = ‘pa_author’ OR ttax.taxonomy = ‘pa_binding’ OR ttax.taxonomy = ‘pa_brand’ OR ttax.taxonomy = ‘pa_color’ OR ttax.taxonomy = ‘pa_manufacturer’ OR ttax.taxonomy = ‘pa_model’ OR ttax.taxonomy = ‘pa_size’ OR ttax.taxonomy = ‘promo_type’ OR ttax.taxonomy = ‘recipe_category’ OR ttax.taxonomy = ‘video_cat’ OR ttax.taxonomy = ‘gtmag_rstrnt’ OR ttax.taxonomy = ‘hot_shots’ OR ttax.taxonomy = ‘issues’ OR ttax.taxonomy = ‘gtmag_brunch’ OR ttax.taxonomy = ‘gtmag_happyhour’ OR ttax.taxonomy = ‘gtmag_bestof’ OR ttax.taxonomy = ‘post_month’ OR ttax.taxonomy = ‘events_categories’ OR ttax.taxonomy = ‘events_tags’ OR ttax.taxonomy = ‘events_feeds’ OR ttax.taxonomy = ‘events_venues’ ) AND trel.term_taxonomy_id = ttax.term_taxonomy_id) LEFT JOIN wp_terms AS tter ON (ttax.term_id = tter.term_id) LEFT JOIN wp_w2dc_levels_relationships AS w2dc_lr ON w2dc_lr.post_id = wp_posts.ID LEFT JOIN wp_w2dc_levels AS w2dc_levels ON w2dc_levels.id = w2dc_lr.level_id WHERE 1=1 AND ( ( wp_posts.ID IN (197222,197478,198291,198407,198988,199586,200232,201078,225674,247534,247549,274987,301787,309601,274947,199750,306359,354975,356725,360954,306361,200195,364865,366575,199912,303743,310568,199013,370286,353472,356718,360943,356724,225965,383973,385677,363946,353209,371730,247547,201076,197793,388350,275171) AND (((((wp_posts.post_title LIKE ‘%restaurant%’) OR (wp_posts.post_content LIKE ‘%restaurant%’))) OR ((tter.name LIKE ‘%restaurant%’)) OR ((tter.slug LIKE ‘%restaurant%’)) OR ((ttax.description LIKE ‘%restaurant%’)) )) AND ( \n wp_postmeta.meta_key = ‘_order_date’\n) AND wp_posts.post_type = ‘w2dc_listing’ AND ((wp_posts.post_status = ‘publish’))) AND post_type != ‘revision’) AND post_status != ‘future’ AND ( ( 1=1 AND ( \n wp_term_relationships.term_taxonomy_id IN (39721)\n) ) OR ( 1=1 AND (((wp_posts.post_title LIKE ‘%restaurant%’) OR (wp_posts.post_excerpt LIKE ‘%restaurant%’) OR (wp_posts.post_content LIKE ‘%restaurant%’))) AND (wp_posts.post_password = ”) ) ) GROUP BY wp_posts.ID ORDER BY w2dc_levels.sticky DESC, w2dc_levels.featured DESC, wp_posts.post_title LIKE ‘%Closed%’ ASC, wp_posts.post_type LIKE ‘w2dc_listing’ DESC, , wp_posts.post_title ASC, wp_postmeta.meta_value+0 ASC LIMIT 0, 20 /* From [www.great-taste.net/directory/?w2dc_action=search&controller=listings_controller&include_categories_children=1&directories=1&categories=&categories_text=&what_search=restaurant&location_id=&location_id_text=&address=92782&radius=0&use_advanced=0&submit=] in [/nas/content/live/greattaste/wp-content/plugins/codecanyon-6463373-web-20-directory-plugin-for-wordpress/classes/shortcodes/directory_controller.php:284] */ made by require(‘wp-blog-header.php’), wp, WP->main, do_action_ref_array(‘wp’), WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, w2dc_plugin->loadFrontendControllers, w2dc_plugin->loadNestedFrontendController, w2dc_plugin->loadNestedFrontendController, w2dc_plugin->loadNestedFrontendController, w2dc_directory_controller->init, WP_Query->__construct, WP_Query->query, WP_Query->get_posts
[Sun Jun 09 23:20:26.963491 2019] [php7:notice] [pid 20126] [client 3.92.224.54:63102] All-in-One Event Calendar: unserialize(): Error at offset 236 of 265 bytes @ /nas/content/live/greattaste/wp-content/plugins/all-in-one-event-calendar/app/model/event.php:428 #8
[Sun Jun 09 23:20:27.167518 2019] [php7:notice] [pid 20126] [client 3.92.224.54:63102] All-in-One Event Calendar: unserialize(): Error at offset 236 of 265 bytes @ /nas/content/live/greattaste/wp-content/plugins/all-in-one-event-calendar/app/model/event.php:428 #8

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