diff --git a/web/skins/classic/css/base/views/timeline.css.php b/web/skins/classic/css/base/views/timeline.css.php
index a9d7be691..d993ce9a0 100644
--- a/web/skins/classic/css/base/views/timeline.css.php
+++ b/web/skins/classic/css/base/views/timeline.css.php
@@ -1,3 +1,12 @@
+<?php
+  global $chart;
+  global $max_aspect_ratio;
+  global $monitors;
+  global $mode;
+  global $monEventSlots;
+?>
+
+
 .chartSize {
     height: <?php echo $chart['height'] ?>px;
 }
@@ -19,6 +28,7 @@
 .imageHeight {
 <?php
 switch ( $max_aspect_ratio ) {
+  case null:
   case 1:
     echo 'padding-top: 100%;'; break;
   case 1.33: // 4:3
diff --git a/web/skins/classic/views/js/timeline.js.php b/web/skins/classic/views/js/timeline.js.php
index b48fd83f6..474e403e0 100644
--- a/web/skins/classic/views/js/timeline.js.php
+++ b/web/skins/classic/views/js/timeline.js.php
@@ -1,6 +1,11 @@
 <?php
   global $filterQuery;
   global $monitors;
+  global $minTime;
+  global $midTime;
+  global $maxTime;
+  global $range;
+  global $majXScale;
 ?>
 var filterQuery = '<?php echo validJsStr($filterQuery) ?>';