diff --git a/includes/Shortcode/Embed_Shortcode.php b/includes/Shortcode/Embed_Shortcode.php
index 06a9b7c7d790..1d4abafddde4 100644
--- a/includes/Shortcode/Embed_Shortcode.php
+++ b/includes/Shortcode/Embed_Shortcode.php
@@ -53,11 +53,16 @@ public function register(): void {
 	 *
 	 * @since 1.1.0
 	 *
-	 * @param array<string, string|int> $attributes Shortcode attributes.
-	 * @param string                    $content Shortcode content.
+	 * @param array<string, string|int>|string $attributes Shortcode attributes.
+	 * @param string                           $content    Shortcode content.
 	 * @return string Rendered Shortcode
 	 */
-	public function render_shortcode( array $attributes, string $content ): string { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
+	public function render_shortcode( $attributes, string $content ): string { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
+		// Initialize '$attrs' when not an array OR is an empty string.
+		if ( empty( $attributes ) || ! \is_array( $attributes ) ) {
+			$attributes = [];
+		}
+
 		$attributes = shortcode_atts( $this->default_attrs(), $attributes, self::SHORTCODE_NAME );
 
 		$attributes['class'] = 'wp-shortcode-web-stories-embed';