diff --git a/src/back/jdd-components/horizontal-gallery/horizontal-gallery.jdd.tsx b/src/back/jdd-components/horizontal-gallery/horizontal-gallery.jdd.tsx
index 982fc58..867b4b8 100644
--- a/src/back/jdd-components/horizontal-gallery/horizontal-gallery.jdd.tsx
+++ b/src/back/jdd-components/horizontal-gallery/horizontal-gallery.jdd.tsx
@@ -50,7 +50,7 @@ export class HorizontalGallery extends Component<typeof component_arguments> {
 							<div
 								class="image-wrapper"
 								data-glightbox-target="pictureWrapper"
-								data-glightbox-caption={htmlEscape(image.caption)}
+								data-glightbox-caption={htmlEscape(image.caption || "")}
 							>
 								{render_image(image.image, {
 									sizesAttr: "100vw",