diff --git a/library/Robo47/Controller/Plugin/Tidy.php b/library/Robo47/Controller/Plugin/Tidy.php
index 6c83057..8d9f836 100644
--- a/library/Robo47/Controller/Plugin/Tidy.php
+++ b/library/Robo47/Controller/Plugin/Tidy.php
@@ -199,7 +199,7 @@ public function dispatchLoopShutdown()
                 $pos = strpos(
                     $tidy->errorBuffer, 'No warnings or errors were found'
                 );
-                if (false === $pos) {
+                if (false === $pos && $tidy->errorBuffer !== null) {
                     $this->_log->log(
                         'Url: ' . $this->getRequest()->getRequestUri() .
                         PHP_EOL . $tidy->errorBuffer, $this->getLogPriority(),