diff --git a/core/modules/views/src/Plugin/Derivative/ViewsBlock.php b/core/modules/views/src/Plugin/Derivative/ViewsBlock.php
index 0d83399..7db35d9 100644
--- a/core/modules/views/src/Plugin/Derivative/ViewsBlock.php
+++ b/core/modules/views/src/Plugin/Derivative/ViewsBlock.php
@@ -120,6 +120,9 @@ public function getDerivativeDefinitions($base_plugin_definition) {
           if ($arguments = $display->getOption('arguments')) {
             foreach ($arguments as $argument_name => $argument) {
               if (!empty($argument['specify_validation'])) {
+                if (!isset($argument['validate'])) {
+                  continue;
+                }
                 if (strpos($argument['validate']['type'], 'entity:') !== FALSE) {
                   $this->derivatives[$delta]['context'][$argument_name] = new ContextDefinition($argument['validate']['type'], $argument_name, FALSE);
                 }