fixed #5782

src/socket.io/posts/edit.js

@@ -15,7 +15,7 @@ module.exports = function (SocketPosts) {
 	SocketPosts.edit = function (socket, data, callback) {
 		if (!socket.uid) {
 			return callback(new Error('[[error:not-logged-in]]'));
-		} else if (!data || !data.pid || !data.content) {
+		} else if (!data || !data.pid || (parseInt(meta.config.minimumPostLength, 10) !== 0 && !data.content)) {
 			return callback(new Error('[[error:invalid-data]]'));
 		}
 
@@ -30,7 +30,7 @@ module.exports = function (SocketPosts) {
 			return callback(new Error('[[error:not-enough-tags, ' + meta.config.minimumTagsPerTopic + ']]'));
 		} else if (data.tags && data.tags.length > parseInt(meta.config.maximumTagsPerTopic, 10)) {
 			return callback(new Error('[[error:too-many-tags, ' + meta.config.maximumTagsPerTopic + ']]'));
-		} else if (contentLen < parseInt(meta.config.minimumPostLength, 10)) {
+		} else if (parseInt(meta.config.minimumPostLength, 10) !== 0 && contentLen < parseInt(meta.config.minimumPostLength, 10)) {
 			return callback(new Error('[[error:content-too-short, ' + meta.config.minimumPostLength + ']]'));
 		} else if (contentLen > parseInt(meta.config.maximumPostLength, 10)) {
 			return callback(new Error('[[error:content-too-long, ' + meta.config.maximumPostLength + ']]'));

src/topics/create.js

@@ -104,6 +104,11 @@ module.exports = function (Topics) {
 				if (data.content) {
 					data.content = utils.rtrim(data.content);
 				}
+
+				if (parseInt(meta.config.minimumPostLength, 10) === 0) {
+					// Abort if minimum post length is set to 0
+					return setImmediate(next);
+				}
 				check(data.content, meta.config.minimumPostLength, meta.config.maximumPostLength, 'content-too-short', 'content-too-long', next);
 			},
 			function (next) {