diff --git a/CHANGELOG b/CHANGELOG
index 5a5dd71d8b8..34b83175f2d 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -5,6 +5,7 @@ CHANGELOG Roundcube Webmail
 - Fix bug where pink image was used instead of a thumbnail when image resize fails (#5933)
 - Fix so files size/count limit is verified (client-side) also on drag-n-drop uploads (#5940)
 - Fix invalid template loading on a message error in preview frame (#5941)
+- Fix bug where HTML messages could have been rendered empty on some systems (#5957)
 
 RELEASE 1.3.1
 -------------
diff --git a/program/lib/Roundcube/rcube_washtml.php b/program/lib/Roundcube/rcube_washtml.php
index 4375bcc4cd1..0880764a000 100644
--- a/program/lib/Roundcube/rcube_washtml.php
+++ b/program/lib/Roundcube/rcube_washtml.php
@@ -311,17 +311,17 @@ private function wash_attribs($node)
                     }
                 }
 
-                if ($this->is_image_attribute($node->tagName, $key)) {
+                if ($this->is_image_attribute($node->nodeName, $key)) {
                     $out = $this->wash_uri($value, true);
                 }
-                else if ($this->is_link_attribute($node->tagName, $key)) {
+                else if ($this->is_link_attribute($node->nodeName, $key)) {
                     if (!preg_match('!^(javascript|vbscript|data:text)!i', $value)
                         && preg_match('!^([a-z][a-z0-9.+-]+:|//|#).+!i', $value)
                     ) {
                         $out = $value;
                     }
                 }
-                else if ($this->is_funciri_attribute($node->tagName, $key)) {
+                else if ($this->is_funciri_attribute($node->nodeName, $key)) {
                     if (preg_match('/^[a-z:]*url\(/i', $val)) {
                         if (preg_match('/^([a-z:]*url)\(\s*[\'"]?([^\'"\)]*)[\'"]?\s*\)/iu', $value, $match)) {
                             if ($url = $this->wash_uri($match[2])) {
@@ -454,14 +454,14 @@ private function dumpHtml($node, $level = 20)
         do {
             switch ($node->nodeType) {
             case XML_ELEMENT_NODE: //Check element
-                $tagName = strtolower($node->tagName);
+                $tagName = strtolower($node->nodeName);
                 if ($callback = $this->handlers[$tagName]) {
                     $dump .= call_user_func($callback, $tagName,
                         $this->wash_attribs($node), $this->dumpHtml($node, $level), $this);
                 }
                 else if (isset($this->_html_elements[$tagName])) {
                     $content = $this->dumpHtml($node, $level);
-                    $dump .= '<' . $node->tagName;
+                    $dump .= '<' . $node->nodeName;
 
                     if ($tagName == 'svg') {
                         $xpath = new DOMXPath($node->ownerDocument);
@@ -481,14 +481,14 @@ private function dumpHtml($node, $level = 20)
                         $dump .= ' />';
                     }
                     else {
-                        $dump .= '>' . $content . '</' . $node->tagName . '>';
+                        $dump .= '>' . $content . '</' . $node->nodeName . '>';
                     }
                 }
                 else if (isset($this->_ignore_elements[$tagName])) {
-                    $dump .= '<!-- ' . htmlspecialchars($node->tagName, ENT_QUOTES) . ' not allowed -->';
+                    $dump .= '<!-- ' . htmlspecialchars($node->nodeName, ENT_QUOTES) . ' not allowed -->';
                 }
                 else {
-                    $dump .= '<!-- ' . htmlspecialchars($node->tagName, ENT_QUOTES) . ' ignored -->';
+                    $dump .= '<!-- ' . htmlspecialchars($node->nodeName, ENT_QUOTES) . ' ignored -->';
                     $dump .= $this->dumpHtml($node, $level); // ignore tags not its content
                 }
                 break;