diff --git a/install/package.json b/install/package.json
index c43195f359..03700a76ed 100644
--- a/install/package.json
+++ b/install/package.json
@@ -103,7 +103,7 @@
         "nodebb-plugin-spam-be-gone": "0.7.6",
         "nodebb-rewards-essentials": "0.1.4",
         "nodebb-theme-lavender": "5.0.14",
-        "nodebb-theme-persona": "10.2.84",
+        "nodebb-theme-persona": "10.2.85",
         "nodebb-theme-slick": "1.3.3",
         "nodebb-theme-vanilla": "11.3.4",
         "nodebb-widget-essentials": "4.1.2",
diff --git a/src/topics/thumb.js b/src/topics/thumb.js
index 1423e3382e..15574779e6 100644
--- a/src/topics/thumb.js
+++ b/src/topics/thumb.js
@@ -23,6 +23,11 @@ module.exports = function (Topics) {
 	const pipeToFileAsync = util.promisify(pipeToFile);
 
 	Topics.resizeAndUploadThumb = async function (data) {
+		// Handle protocol-relative URLs
+		if (data.thumb && data.thumb.startsWith('//')) {
+			data.thumb = `${nconf.get('secure') ? 'https' : 'http'}:${data.thumb}`;
+		}
+
 		// Only continue if passed in thumbnail exists and is a URL. A system path means an upload is not necessary.
 		if (!data.thumb || !validator.isURL(data.thumb)) {
 			return;