1 files changed, 3 insertions, 1 deletions

diff --git a/inc/collectd.inc.php b/inc/collectd.inc.php
index ab4340f..fde3267 100644
--- a/inc/collectd.inc.php
+++ b/inc/collectd.inc.php
@@ -112,7 +112,9 @@ function graphs_from_plugin($host, $plugin) {
         $ts = collectd_plugindetail($host, $plugin, 't');
         $tis = collectd_plugindetail($host, $plugin, 'ti');
         if (!$pis) $pis = array('NULL');
-        if (!$tis || $CONFIG['groupby'][$plugin] == 'type')
+        if (!$tis) $tis = array('NULL');
+        # backwards compatibility
+        if ($CONFIG['version'] >= 5 || !preg_match('/^(df|interface)$/', $plugin))
                 $tis = array('NULL');
 
         foreach($pis as $pi) {