adjust font size

app/javascript/template_builder/document.vue

@@ -29,6 +29,7 @@
 </template>
 <script>
 import Page from './page'
+import { reactive } from 'vue'
 
 export default {
   name: 'TemplateDocument',
@@ -123,14 +124,14 @@ export default {
       return this.document.metadata?.pdf?.number_of_pages || this.document.preview_images.length
     },
     sortedPreviewImages () {
-      const lazyloadMetadata = this.document.preview_images[this.document.preview_images.length - 1].metadata
+      const lazyloadMetadata = this.document.preview_images[this.document.preview_images.length - 1]?.metadata || { width: 1400, height: 1812 }
 
       return [...Array(this.numberOfPages).keys()].map((i) => {
-        return this.previewImagesIndex[i] || {
-          metadata: lazyloadMetadata,
+        return this.previewImagesIndex[i] || reactive({
+          metadata: { ...lazyloadMetadata },
           id: Math.random().toString(),
           url: this.basePreviewUrl + `/preview/${this.document.signed_uuid || this.document.uuid}/${i}.jpg`
-        }
+        })
       })
     },
     previewImagesIndex () {