diff --git a/src/core/view/components/rich-text/nodes-parser.js b/src/core/view/components/rich-text/nodes-parser.js
index 2e681cc00c30ea9dfee1b3e1cbc00294254d03db..d8aff85fa7e98f1f41c9186c66a408b10454469c 100644
--- a/src/core/view/components/rich-text/nodes-parser.js
+++ b/src/core/view/components/rich-text/nodes-parser.js
@@ -55,7 +55,7 @@ const CHARS = {
   'nbsp': ' ',
   'quot': '"',
   'apos': "'"
-}
+}
 
 function decodeEntities (htmlString) {
   return htmlString.replace(/&(([a-zA-Z]+)|(#x{0,1}[\da-zA-Z]+));/gi, function (match, stage) {
@@ -95,9 +95,11 @@ export default function parseNodes (nodes, parentNode) {
       if (isPlainObject(attrs)) {
         const tagAttrs = TAGS[tagName] || []
         Object.keys(attrs).forEach(function (name) {
-          const value = attrs[name]
+          let value = attrs[name]
           switch (name) {
             case 'class':
+              /* eslint-disable no-fallthrough */
+              Array.isArray(value) && (value = value.join(' '))
             case 'style':
               elem.setAttribute(name, value)
               break