diff -u b/core/modules/taxonomy/taxonomy.post_update.php b/core/modules/taxonomy/taxonomy.post_update.php
--- b/core/modules/taxonomy/taxonomy.post_update.php
+++ b/core/modules/taxonomy/taxonomy.post_update.php
@@ -382,7 +382,7 @@
     foreach ($displays as $display_name => &$display) {
       $filters = isset($display['display_options']['filters']) ? $display['display_options']['filters'] : [];
       foreach ($filters as $id => $filter) {
-        if (isset($filter['field'])) {
+        if (isset($filter['field']) && isset($filters[$id]['field']['value'])) {
           $filters[$id]['field']['value'] = taxonomy_convert_entity_ids_to_uuids($filters[$id]['field']['value']);
         }
       }