symfony
diff --git a/‎src/Symfony/Component/Notifier/Bridge/Slack/SlackOptions.php
Lines changed: 14 additions & 0 deletions b/‎src/Symfony/Component/Notifier/Bridge/Slack/SlackOptions.php
Lines changed: 14 additions & 0 deletions
diff --git a/‎src/Symfony/Component/Notifier/Bridge/Slack/Tests/SlackOptionsTest.php
Lines changed: 23 additions & 0 deletions b/‎src/Symfony/Component/Notifier/Bridge/Slack/Tests/SlackOptionsTest.php
Lines changed: 23 additions & 0 deletions
@@ -14,6 +14,7 @@
 use Symfony\Component\Notifier\Bridge\Slack\Block\SlackBlockInterface;
 use Symfony\Component\Notifier\Bridge\Slack\Block\SlackDividerBlock;
 use Symfony\Component\Notifier\Bridge\Slack\Block\SlackSectionBlock;
+use Symfony\Component\Notifier\Exception\LogicException;
 use Symfony\Component\Notifier\Message\MessageOptionsInterface;
 use Symfony\Component\Notifier\Notification\Notification;
 
@@ -22,11 +23,15 @@
  */
 final class SlackOptions implements MessageOptionsInterface
 {
+    private const MAX_BLOCKS = 50;
+
     private $options;
 
     public function __construct(array $options = [])
     {
         $this->options = $options;
+
+        $this->validateNumberOfBlocks();
     }
 
     public static function fromNotification(Notification $notification): self
@@ -97,6 +102,8 @@ public function asUser(bool $bool): self
      */
     public function block(SlackBlockInterface $block): self
     {
+        $this->validateNumberOfBlocks();
+
         $this->options['blocks'][] = $block->toArray();
 
         return $this;
@@ -191,4 +198,11 @@ public function threadTs(string $threadTs): self
 
         return $this;
     }
+
+    private function validateNumberOfBlocks(): void
+    {
+        if (\count($this->options['blocks'] ?? []) >= self::MAX_BLOCKS) {
+            throw new LogicException(sprintf('Maximum number of "blocks" has been reached (%d).', self::MAX_BLOCKS));
+        }
+    }
 }
@@ -14,7 +14,9 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\PhpUnit\ExpectDeprecationTrait;
 use Symfony\Component\Notifier\Bridge\Slack\Block\SlackDividerBlock;
+use Symfony\Component\Notifier\Bridge\Slack\Block\SlackSectionBlock;
 use Symfony\Component\Notifier\Bridge\Slack\SlackOptions;
+use Symfony\Component\Notifier\Exception\LogicException;
 use Symfony\Component\Notifier\Notification\Notification;
 
 /**
@@ -187,4 +189,25 @@ public function fromNotificationProvider(): iterable
             (new Notification($subject))->emoji($emoji)->content($content),
         ];
     }
+
+    public function testConstructThrowsWithTooManyBlocks()
+    {
+        $this->expectException(LogicException::class);
+        $this->expectExceptionMessage('Maximum number of "blocks" has been reached (50).');
+
+        new SlackOptions(['blocks' => array_map(static function () { return ['type' => 'divider']; }, range(0, 50))]);
+    }
+
+    public function testThrowsWhenBlocksLimitReached()
+    {
+        $options = new SlackOptions();
+        for ($i = 0; $i < 50; ++$i) {
+            $options->block(new SlackSectionBlock());
+        }
+
+        $this->expectException(LogicException::class);
+        $this->expectExceptionMessage('Maximum number of "blocks" has been reached (50).');
+
+        $options->block(new SlackSectionBlock());
+    }
 }