diff --git a/scripts/pi-hole/js/groups-adlists.js b/scripts/pi-hole/js/groups-adlists.js
index fc223019..be775d66 100644
--- a/scripts/pi-hole/js/groups-adlists.js
+++ b/scripts/pi-hole/js/groups-adlists.js
@@ -127,8 +127,8 @@ function initTable() {
         })
         .on("changed.bs.select", function () {
           // enable Apply button
-          if ($(ApplyBtn).prop("disabled")) {
-            $(ApplyBtn)
+          if ($(applyBtn).prop("disabled")) {
+            $(applyBtn)
               .addClass("btn-success")
               .prop("disabled", false)
               .on("click", function () {
@@ -138,9 +138,9 @@ function initTable() {
         })
         .on("hide.bs.select", function () {
           // Restore values if drop-down menu is closed without clicking the Apply button
-          if (!$(ApplyBtn).prop("disabled")) {
+          if (!$(applyBtn).prop("disabled")) {
             $(this).val(data.groups).selectpicker("refresh");
-            $(ApplyBtn).removeClass("btn-success").prop("disabled", true).off("click");
+            $(applyBtn).removeClass("btn-success").prop("disabled", true).off("click");
           }
         })
         .selectpicker()
@@ -152,7 +152,7 @@ function initTable() {
             ' class="btn btn-block btn-sm" disabled>Apply</button>'
         );
 
-      var ApplyBtn = "#btn_apply_" + data.id;
+      var applyBtn = "#btn_apply_" + data.id;
 
       var button =
         '<button type="button" class="btn btn-danger btn-xs" id="deleteAdlist_' +
diff --git a/scripts/pi-hole/js/groups-clients.js b/scripts/pi-hole/js/groups-clients.js
index b4dcd47e..ab84f995 100644
--- a/scripts/pi-hole/js/groups-clients.js
+++ b/scripts/pi-hole/js/groups-clients.js
@@ -161,8 +161,8 @@ function initTable() {
         })
         .on("changed.bs.select", function () {
           // enable Apply button
-          if ($(ApplyBtn).prop("disabled")) {
-            $(ApplyBtn)
+          if ($(applyBtn).prop("disabled")) {
+            $(applyBtn)
               .addClass("btn-success")
               .prop("disabled", false)
               .on("click", function () {
@@ -172,9 +172,9 @@ function initTable() {
         })
         .on("hide.bs.select", function () {
           // Restore values if drop-down menu is closed without clicking the Apply button
-          if (!$(ApplyBtn).prop("disabled")) {
+          if (!$(applyBtn).prop("disabled")) {
             $(this).val(data.groups).selectpicker("refresh");
-            $(ApplyBtn).removeClass("btn-success").prop("disabled", true).off("click");
+            $(applyBtn).removeClass("btn-success").prop("disabled", true).off("click");
           }
         })
         .selectpicker()
@@ -186,7 +186,7 @@ function initTable() {
             ' class="btn btn-block btn-sm" disabled>Apply</button>'
         );
 
-      var ApplyBtn = "#btn_apply_" + data.id;
+      var applyBtn = "#btn_apply_" + data.id;
 
       var button =
         '<button type="button" class="btn btn-danger btn-xs" id="deleteClient_' +
diff --git a/scripts/pi-hole/js/groups-domains.js b/scripts/pi-hole/js/groups-domains.js
index 3869d966..15909f4e 100644
--- a/scripts/pi-hole/js/groups-domains.js
+++ b/scripts/pi-hole/js/groups-domains.js
@@ -192,8 +192,8 @@ function initTable() {
           })
           .on("changed.bs.select", function () {
             // enable Apply button
-            if ($(ApplyBtn).prop("disabled")) {
-              $(ApplyBtn)
+            if ($(applyBtn).prop("disabled")) {
+              $(applyBtn)
                 .addClass("btn-success")
                 .prop("disabled", false)
                 .on("click", function () {
@@ -203,9 +203,9 @@ function initTable() {
           })
           .on("hide.bs.select", function () {
             // Restore values if drop-down menu is closed without clicking the Apply button
-            if (!$(ApplyBtn).prop("disabled")) {
+            if (!$(applyBtn).prop("disabled")) {
               $(this).val(data.groups).selectpicker("refresh");
-              $(ApplyBtn).removeClass("btn-success").prop("disabled", true).off("click");
+              $(applyBtn).removeClass("btn-success").prop("disabled", true).off("click");
             }
           })
           .selectpicker()
@@ -218,7 +218,7 @@ function initTable() {
           );
       }
 
-      var ApplyBtn = "#btn_apply_" + data.id;
+      var applyBtn = "#btn_apply_" + data.id;
 
       // Highlight row (if url parameter "domainid=" is used)
       if ("domainid" in GETDict && data.id === parseInt(GETDict.domainid)) {