diff --git a/js/functions.js b/js/functions.js
index 153ccf3e73..75fe3bc6a8 100644
--- a/js/functions.js
+++ b/js/functions.js
@@ -44,11 +44,6 @@ var sql_autocomplete = false;
  */
 var sql_autocomplete_default_table = '';
 
-/**
- * @var chart_activeTimeouts object active timeouts that refresh the charts. When disabling a realtime chart, this can be used to stop the continuous ajax requests
- */
-var chart_activeTimeouts = {};
-
 /**
  * @var central_column_list array to hold the columns in central list per db.
  */
diff --git a/js/makegrid.js b/js/makegrid.js
index bfa69efb64..75bd4c633f 100644
--- a/js/makegrid.js
+++ b/js/makegrid.js
@@ -1405,7 +1405,6 @@ function PMA_makegrid(t, enableResize, enableReorder, enableVisib, enableGridEdi
              * @var is_null String capturing whether 'checkbox_null_<field_name>_<row_index>' is checked.
              */
             var is_null = $(g.cEdit).find('input:checkbox').is(':checked');
-            var value;
 
             if ($(g.cEdit).find('.edit_area').is('.edit_area_loading')) {
                 // the edit area is still loading (retrieving cell data), no need to post
@@ -1579,14 +1578,14 @@ function PMA_makegrid(t, enableResize, enableReorder, enableVisib, enableGridEdi
                         g.dragStartReorder(e, this);
                     }
                 })
-                .mouseenter(function (e) {
+                .mouseenter(function () {
                     if (g.visibleHeadersCount > 1) {
                         $(this).css('cursor', 'move');
                     } else {
                         $(this).css('cursor', 'inherit');
                     }
                 })
-                .mouseleave(function (e) {
+                .mouseleave(function () {
                     g.showReorderHint = false;
                     $(this).tooltip("option", {
                         content: g.updateHint()
@@ -2028,7 +2027,7 @@ function PMA_makegrid(t, enableResize, enableReorder, enableVisib, enableGridEdi
 
             $(g.cEditStd).on('keydown', 'input.edit_box, select', handleCtrlNavigation);
 
-            $(g.cEditStd).find('.edit_box').focus(function (e) {
+            $(g.cEditStd).find('.edit_box').focus(function () {
                 g.showEditArea();
             });
             $(g.cEditStd).on('keydown', '.edit_box, select', function (e) {
@@ -2047,7 +2046,7 @@ function PMA_makegrid(t, enableResize, enableReorder, enableVisib, enableGridEdi
 
             $(g.cEditTextarea).on('keydown', 'textarea.edit_box, select', handleCtrlNavigation);
 
-            $(g.cEditTextarea).find('.edit_box').focus(function (e) {
+            $(g.cEditTextarea).find('.edit_box').focus(function () {
                 g.showEditArea();
             });
             $(g.cEditTextarea).on('keydown', '.edit_box, select', function (e) {
@@ -2082,7 +2081,7 @@ function PMA_makegrid(t, enableResize, enableReorder, enableVisib, enableGridEdi
                 g.hideEditCell();
                 g.postEditedCell();
             });
-            $(window).bind('beforeunload', function (e) {
+            $(window).bind('beforeunload', function () {
                 if (g.isCellEdited) {
                     return g.saveCellWarning;
                 }
@@ -2199,14 +2198,14 @@ function PMA_makegrid(t, enableResize, enableReorder, enableVisib, enableGridEdi
 
     // register events for hint tooltip (anchors inside draggable th)
     $(t).find('th.draggable a')
-        .mouseenter(function (e) {
+        .mouseenter(function () {
             g.showSortHint = true;
             g.showMultiSortHint = true;
             $(t).find("th.draggable").tooltip("option", {
                 content: g.updateHint()
             });
         })
-        .mouseleave(function (e) {
+        .mouseleave(function () {
             g.showSortHint = false;
             g.showMultiSortHint = false;
             $(t).find("th.draggable").tooltip("option", {
diff --git a/js/tbl_structure.js b/js/tbl_structure.js
index 9e727317e7..3dbfa32809 100644
--- a/js/tbl_structure.js
+++ b/js/tbl_structure.js
@@ -93,7 +93,6 @@ AJAX.registerOnload('tbl_structure.js', function () {
 
     // Re-initialize variables.
     primary_indexes = [];
-    unique_indexes = [];
     indexes = [];
     fulltext_indexes = [];
     spatial_indexes = [];