From 386d5700cf19e5db160de19b506659d2bc6650f7 Mon Sep 17 00:00:00 2001
From: Tilman Vatteroth <git@tilmanvatteroth.de>
Date: Thu, 19 Oct 2023 20:18:07 +0200
Subject: [PATCH] fix(frontend): fix revision-viewer type

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>
---
 .../revisions-modal/revision-viewer.tsx                       | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/frontend/src/components/editor-page/sidebar/specific-sidebar-entries/revisions-sidebar-entry/revisions-modal/revision-viewer.tsx b/frontend/src/components/editor-page/sidebar/specific-sidebar-entries/revisions-sidebar-entry/revisions-modal/revision-viewer.tsx
index af5adfd28..d4f13ba44 100644
--- a/frontend/src/components/editor-page/sidebar/specific-sidebar-entries/revisions-sidebar-entry/revisions-modal/revision-viewer.tsx
+++ b/frontend/src/components/editor-page/sidebar/specific-sidebar-entries/revisions-sidebar-entry/revisions-modal/revision-viewer.tsx
@@ -48,7 +48,7 @@ export const RevisionViewer: React.FC<RevisionViewerProps> = ({ selectedRevision
       return ''
     }
     const inversePatch = invertUnifiedPatch(patches[0])
-    return applyPatch(revision.content, inversePatch)
+    return applyPatch(revision.content, inversePatch) || ''
   }, [revision])
 
   if (selectedRevisionId === undefined) {
@@ -58,7 +58,7 @@ export const RevisionViewer: React.FC<RevisionViewerProps> = ({ selectedRevision
   return (
     <AsyncLoadingBoundary loading={loading || !revision} componentName={'RevisionViewer'} error={error}>
       <ReactDiffViewer
-        oldValue={previousRevisionContent ?? ''}
+        oldValue={previousRevisionContent}
         newValue={revision?.content ?? ''}
         splitView={false}
         compareMethod={DiffMethod.WORDS}