diff --git a/src/components/DocumentViewer.tsx b/src/components/DocumentViewer.tsx
index fc48ad766..facda1f1b 100644
--- a/src/components/DocumentViewer.tsx
+++ b/src/components/DocumentViewer.tsx
@@ -2282,11 +2282,11 @@ export function DocumentViewer({
 
   async function summarize() {
     if (!canSummarizeDocument) {
-      setSummaryError("Load a source document before summarising.");
-      return;
-    }
-    if (!canUsePrivateApis) {
-      setSummaryError("Sign in before summarising private documents.");
+      setSummaryError(
+        !canUsePrivateApis
+          ? "Sign in before summarising private documents."
+          : "Load a source document before summarising.",
+      );
       return;
     }
     const summaryMode = sourceSearch.trim().length === 0;
@@ -2407,11 +2407,11 @@ export function DocumentViewer({
     ? `/?mode=documents&q=${encodeURIComponent(documentDisplayTitle(readyDocument))}&documentId=${encodeURIComponent(documentId)}`
     : documentHomeHref;
   const usefulPageHref = (page: number) => documentPageHref(documentId, page);
-  const canSummarizeDocument = viewerState === "ready" && !loadingSummary && canViewSourceDocuments;
+  const canSummarizeDocument = viewerState === "ready" && !loadingSummary && canUsePrivateApis;
   const summarizeTitle = canSummarizeDocument
     ? "Answer from this document"
-    : loadingSummary
-      ? "Answer is generating"
+    : !canUsePrivateApis
+      ? "Sign in required to answer from this document"
       : "Load a source document before answering";
   const pageByNumber = useMemo(() => new Map(pages.map((page) => [page.page_number, page])), [pages]);
   const chunkById = useMemo(() => new Map(chunks.map((chunk) => [chunk.id, chunk])), [chunks]);