fix: #9126, skip base64 and long values

src/upgrades/1.16.0/migrate_thumbs.js

@@ -17,16 +17,18 @@ module.exports = {
 		if (parseInt(current, 10) === 120) {
 			await meta.configs.set('topicThumbSize', 512);
 		}
-		await meta.configs.set('allowTopicsThumbnail', 1);
 
 		await batch.processSortedSet('topics:tid', async function (tids) {
 			const keys = tids.map(tid => `topic:${tid}`);
-			const topicThumbs = (await db.getObjectsFields(keys, ['thumb'])).map(obj => (obj.thumb ? obj.thumb.replace(nconf.get('upload_url'), '') : null));
+			const topicThumbs = (await db.getObjectsFields(keys, ['thumb']))
+				.map(obj => (obj.thumb ? obj.thumb.replace(nconf.get('upload_url'), '') : null));
 
 			await Promise.all(tids.map(async (tid, idx) => {
 				const path = topicThumbs[idx];
 				if (path) {
+					if (path.length < 255 && !path.startsWith('data:')) {
 						await topics.thumbs.associate({ id: tid, path });
+					}
 					await db.deleteObjectField(keys[idx], 'thumb');
 				}