diff --git a/src/Plugin/DisplayBuilder/StandardDisplayBuilder.php b/src/Plugin/DisplayBuilder/StandardDisplayBuilder.php
index 85287d7..0183358 100644
--- a/src/Plugin/DisplayBuilder/StandardDisplayBuilder.php
+++ b/src/Plugin/DisplayBuilder/StandardDisplayBuilder.php
@@ -106,6 +106,10 @@ class StandardDisplayBuilder extends DisplayBuilderBase implements PluginWizardI
         if ($block->access($this->account)) {
           $content = $block->build();
 
+          if (is_null($content)) {
+            $content = [];
+          }
+
           if (!is_array($content)) {
             throw new \LogicException(sprintf(
               '%s::build() method has to return an array. Class returning non-array value is: %s',