diff --git a/services/web/frontend/js/features/pdf-preview/components/pdf-js-viewer.js b/services/web/frontend/js/features/pdf-preview/components/pdf-js-viewer.js
index 43c6fcf38d..936bcbb07b 100644
--- a/services/web/frontend/js/features/pdf-preview/components/pdf-js-viewer.js
+++ b/services/web/frontend/js/features/pdf-preview/components/pdf-js-viewer.js
@@ -325,11 +325,15 @@ function PdfJsViewer({ url, pdfFile }) {
           break
 
         case 'zoom-in':
-          setScale(pdfJsWrapper.viewer.currentScale * 1.25)
+          if (pdfJsWrapper) {
+            setScale(pdfJsWrapper.viewer.currentScale * 1.25)
+          }
           break
 
         case 'zoom-out':
-          setScale(pdfJsWrapper.viewer.currentScale * 0.75)
+          if (pdfJsWrapper) {
+            setScale(pdfJsWrapper.viewer.currentScale * 0.75)
+          }
           break
       }
     },