diff --git a/pages/settings.page.tsx b/pages/settings.page.tsx
index 87b7c1f..83aaa15 100644
--- a/pages/settings.page.tsx
+++ b/pages/settings.page.tsx
@@ -87,8 +87,9 @@ const Label = ({
     case ComparisonType.Effort:
       return (
         <span>
-          <abbr title={issueA?.title}>{issueA?.key}</abbr> is quicker to resolve
-          than <abbr title={issueB?.title}>{issueB?.key}</abbr>{" "}
+          <abbr title={issueA?.title}>{issueA?.key ?? "UNKNOWN"}</abbr> is
+          quicker to resolve than{" "}
+          <abbr title={issueB?.title}>{issueB?.key ?? "UNKNOWN"}</abbr>{" "}
           <button
             onClick={() => {
               removeEffortComparison(comparison.id);
@@ -101,8 +102,9 @@ const Label = ({
     case ComparisonType.Value:
       return (
         <span>
-          <abbr title={issueA?.title}>{issueA?.key}</abbr> should be resolved
-          before <abbr title={issueB?.title}>{issueB?.key}</abbr>{" "}
+          <abbr title={issueA?.title}>{issueA?.key ?? "UNKNOWN"}</abbr> should
+          be resolved before{" "}
+          <abbr title={issueB?.title}>{issueB?.key ?? "UNKNOWN"}</abbr>{" "}
           <button
             onClick={() => {
               removeValueComparison(comparison.id);