Throw exception on exceeding frame count

src/Drivers/Imagick/Core.php

@@ -7,6 +7,7 @@ use ImagickException;
 use Iterator;
 use Intervention\Image\Interfaces\CoreInterface;
 use Intervention\Image\Exceptions\AnimationException;
+use Intervention\Image\Exceptions\RuntimeException;
 use Intervention\Image\Interfaces\CollectionInterface;
 use Intervention\Image\Interfaces\FrameInterface;
 
@@ -89,6 +90,10 @@ class Core implements CoreInterface, Iterator
      */
     public function slice(int $offset, ?int $length = null): CollectionInterface
     {
+        if ($offset >= $this->count()) {
+            throw new RuntimeException('Offset exceeds the maximum value.');
+        }
+
         $allowed_indexes = [];
         $length = is_null($length) ? $this->count() : $length;
         for ($i = $offset; $i < $offset + $length; $i++) {