diff --git a/install/package.json b/install/package.json
index 0aea970134..a6c3bba32c 100644
--- a/install/package.json
+++ b/install/package.json
@@ -101,10 +101,10 @@
         "nodebb-plugin-ntfy": "1.0.15",
         "nodebb-plugin-spam-be-gone": "2.1.1",
         "nodebb-rewards-essentials": "0.2.3",
-        "nodebb-theme-harmony": "1.0.65",
+        "nodebb-theme-harmony": "1.0.66",
         "nodebb-theme-lavender": "7.1.1",
         "nodebb-theme-peace": "2.0.32",
-        "nodebb-theme-persona": "13.1.7",
+        "nodebb-theme-persona": "13.1.8",
         "nodebb-widget-essentials": "7.0.13",
         "nodemailer": "6.9.3",
         "nprogress": "0.2.0",
diff --git a/public/src/admin/appearance/themes.js b/public/src/admin/appearance/themes.js
index 36a98c6a38..f2a023206f 100644
--- a/public/src/admin/appearance/themes.js
+++ b/public/src/admin/appearance/themes.js
@@ -46,20 +46,20 @@ define('admin/appearance/themes', ['bootbox', 'translator', 'alerts'], function
 		});
 
 		$('#revert_theme').on('click', function () {
-			if (config['theme:id'] === 'nodebb-theme-persona') {
+			if (config['theme:id'] === 'nodebb-theme-harmony') {
 				return;
 			}
 			bootbox.confirm('[[admin/appearance/themes:revert-confirm]]', function (confirm) {
 				if (confirm) {
 					socket.emit('admin.themes.set', {
 						type: 'local',
-						id: 'nodebb-theme-persona',
+						id: 'nodebb-theme-harmony',
 					}, function (err) {
 						if (err) {
 							return alerts.error(err);
 						}
-						config['theme:id'] = 'nodebb-theme-persona';
-						highlightSelectedTheme('nodebb-theme-persona');
+						config['theme:id'] = 'nodebb-theme-harmony';
+						highlightSelectedTheme('nodebb-theme-harmony');
 						alerts.alert({
 							alert_id: 'admin:theme',
 							type: 'success',
diff --git a/public/src/modules/helpers.common.js b/public/src/modules/helpers.common.js
index d607d7e20f..123b5eccc6 100644
--- a/public/src/modules/helpers.common.js
+++ b/public/src/modules/helpers.common.js
@@ -327,11 +327,11 @@ module.exports = function (utils, Benchpress, relative_path) {
 	}
 
 	function generateRepliedTo(post, timeagoCutoff) {
-		const username = post.parent && post.parent.username ?
-			post.parent.username : '[[global:guest]]';
+		const displayname = post.parent && post.parent.displayname ?
+			post.parent.displayname : '[[global:guest]]';
 		const isBeforeCutoff = post.timestamp < (Date.now() - (timeagoCutoff * oneDayInMs));
 		const langSuffix = isBeforeCutoff ? 'on' : 'ago';
-		return `[[topic:replied-to-user-${langSuffix}, ${post.toPid}, ${relative_path}/post/${post.toPid}, ${username}, ${relative_path}/post/${post.pid}, ${post.timestampISO}]]`;
+		return `[[topic:replied-to-user-${langSuffix}, ${post.toPid}, ${relative_path}/post/${post.toPid}, ${displayname}, ${relative_path}/post/${post.pid}, ${post.timestampISO}]]`;
 	}
 
 	function generateWrote(post, timeagoCutoff) {
diff --git a/src/middleware/helpers.js b/src/middleware/helpers.js
index a0ebb06d20..dde0c3b749 100644
--- a/src/middleware/helpers.js
+++ b/src/middleware/helpers.js
@@ -65,7 +65,7 @@ helpers.buildBodyClass = function (req, res, templateData = {}) {
 
 	parts.push(`page-status-${res.statusCode}`);
 
-	parts.push(`theme-${meta.config['theme:id'].split('-')[2]}`);
+	parts.push(`theme-${(meta.config['theme:id'] || '').split('-')[2]}`);
 
 	if (req.loggedIn) {
 		parts.push('user-loggedin');
diff --git a/src/topics/posts.js b/src/topics/posts.js
index 58ad3d20c9..438844d753 100644
--- a/src/topics/posts.js
+++ b/src/topics/posts.js
@@ -186,13 +186,13 @@ module.exports = function (Topics) {
 		const parentUids = _.uniq(parentPosts.map(postObj => postObj && postObj.uid));
 		const userData = await user.getUsersFields(parentUids, ['username']);
 
-		const usersMap = {};
-		userData.forEach((user) => {
-			usersMap[user.uid] = user.username;
-		});
+		const usersMap = _.zipObject(parentUids, userData);
 		const parents = {};
 		parentPosts.forEach((post, i) => {
-			parents[parentPids[i]] = { username: usersMap[post.uid] };
+			parents[parentPids[i]] = {
+				username: usersMap[post.uid].username,
+				displayname: usersMap[post.uid].displayname,
+			};
 		});
 
 		postData.forEach((post) => {