diff --git a/routers/web/shared/user/header.go b/routers/web/shared/user/header.go
index 400c10f9d0..abcd848697 100644
--- a/routers/web/shared/user/header.go
+++ b/routers/web/shared/user/header.go
@@ -213,9 +213,15 @@ func loadHeaderCount(ctx *context.Context) error {
 func OrgWikiRepoExists(ctx *context.Context, ownerID int64, repoName string) bool {
 	dbRepo, err := repo_model.GetRepositoryByName(ctx, ownerID, repoName)
 	if err != nil {
+		log.Trace("OrgWikiRepoExists: repo %s not found for owner %d: %v", repoName, ownerID, err)
 		return false
 	}
-	// Check if the wiki sidecar repo exists by trying to get its default branch.
-	_, err = gitrepo.GetDefaultBranch(ctx, dbRepo.WikiStorageRepo())
-	return err == nil
+	wikiRepo := dbRepo.WikiStorageRepo()
+	_, err = gitrepo.GetDefaultBranch(ctx, wikiRepo)
+	if err != nil {
+		log.Error("OrgWikiRepoExists: GetDefaultBranch for wiki of %s failed: %v (path: %s)", dbRepo.FullName(), err, wikiRepo.RelativePath())
+		return false
+	}
+	log.Trace("OrgWikiRepoExists: wiki found for %s", dbRepo.FullName())
+	return true
 }