diff --git a/resources/assets/src/js/admin/customize.js b/resources/assets/src/js/admin/customize.js
index 6dda2a93..f9fc5e90 100644
--- a/resources/assets/src/js/admin/customize.js
+++ b/resources/assets/src/js/admin/customize.js
@@ -17,7 +17,7 @@ function submitColor() {
         data: { color_scheme: current_skin }
     }).then(({ errno, msg }) => {
         (errno == 0) ? toastr.success(msg) : toastr.warning(msg);
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 $('#color-submit').click(submitColor);
diff --git a/resources/assets/src/js/admin/players.js b/resources/assets/src/js/admin/players.js
index 11b3613a..0103a5cc 100644
--- a/resources/assets/src/js/admin/players.js
+++ b/resources/assets/src/js/admin/players.js
@@ -11,7 +11,7 @@ function changePreference() {
         }
     }).then(({ errno, msg }) => {
         (errno == 0) ? toastr.success(msg) : toastr.warning(msg);
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function changeTexture(pid, playerName) {
@@ -58,7 +58,7 @@ function ajaxChangeTexture(pid) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function changePlayerName(pid, oldName) {
@@ -85,7 +85,7 @@ function changePlayerName(pid, oldName) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function changeOwner(pid) {
@@ -113,7 +113,7 @@ function changeOwner(pid) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 
     $('.swal2-input').on('input', debounce(() => {
         let uid = $('.swal2-input').val();
@@ -158,7 +158,7 @@ function deletePlayer(pid) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 if (typeof require !== 'undefined' && typeof module !== 'undefined') {
diff --git a/resources/assets/src/js/admin/plugins.js b/resources/assets/src/js/admin/plugins.js
index 87d091cc..216cba85 100644
--- a/resources/assets/src/js/admin/plugins.js
+++ b/resources/assets/src/js/admin/plugins.js
@@ -13,7 +13,7 @@ function enablePlugin(name) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function disablePlugin(name) {
@@ -29,7 +29,7 @@ function disablePlugin(name) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function deletePlugin(name) {
@@ -49,7 +49,7 @@ function deletePlugin(name) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 if (typeof require !== 'undefined' && typeof module !== 'undefined') {
diff --git a/resources/assets/src/js/admin/update.js b/resources/assets/src/js/admin/update.js
index 22f22f86..e7c088ab 100644
--- a/resources/assets/src/js/admin/update.js
+++ b/resources/assets/src/js/admin/update.js
@@ -39,7 +39,7 @@ function downloadUpdates() {
 
             console.log('Downloading finished');
             console.log(json);
-        }).catch(err => showAjaxError(err));
+        }).catch(showAjaxError);
 
         // Downloading progress polling
         let interval_id = window.setInterval(() => {
@@ -70,7 +70,7 @@ function downloadUpdates() {
                     }, function() {
                         window.location = url('/');
                     });
-                }).catch(err => showAjaxError(err));
+                }).catch(showAjaxError);
 
             } else {
                 fetch({
@@ -80,11 +80,11 @@ function downloadUpdates() {
                     progress = (json.size / fileSize * 100).toFixed(2);
 
                     console.log('Progress: ' + progress);
-                }).catch(err => showAjaxError(err));
+                }).catch(showAjaxError);
             }
 
         }, 300);
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 
 }
 
diff --git a/resources/assets/src/js/admin/users.js b/resources/assets/src/js/admin/users.js
index 456ff5f2..228c048b 100644
--- a/resources/assets/src/js/admin/users.js
+++ b/resources/assets/src/js/admin/users.js
@@ -25,7 +25,7 @@ function changeUserEmail(uid) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function changeUserNickName(uid) {
@@ -53,7 +53,7 @@ function changeUserNickName(uid) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function changeUserPwd(uid) {
@@ -68,7 +68,7 @@ function changeUserPwd(uid) {
         data: { uid: uid, password: password }
     })).then(({ errno, msg }) => {
         (errno == 0) ? toastr.success(msg) : toastr.warning(msg);
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function changeUserScore(uid, score) {
@@ -80,7 +80,7 @@ function changeUserScore(uid, score) {
         data: { uid: uid.slice(5), score: score }
     }).then(({ errno, msg }) => {
         (errno == 0) ? toastr.success(msg) : toastr.warning(msg);
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function changeBanStatus(uid) {
@@ -107,7 +107,7 @@ function changeBanStatus(uid) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function changeAdminStatus(uid) {
@@ -134,7 +134,7 @@ function changeAdminStatus(uid) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function deleteUserAccount(uid) {
@@ -154,7 +154,7 @@ function deleteUserAccount(uid) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 $('body').on('keypress', '.score', function(event){
diff --git a/resources/assets/src/js/common/texture-preview.js b/resources/assets/src/js/common/texture-preview.js
index e4f4ea7c..007b7f90 100644
--- a/resources/assets/src/js/common/texture-preview.js
+++ b/resources/assets/src/js/common/texture-preview.js
@@ -33,7 +33,7 @@ class TexturePreview {
                 } else {
                     MSP.changeSkin(textureUrl);
                 }
-            }).catch(err => showAjaxError(err));
+            }).catch(showAjaxError);
         }
 
         return this;
diff --git a/resources/assets/src/js/skinlib/operations.js b/resources/assets/src/js/skinlib/operations.js
index f245da0b..4032aa3f 100644
--- a/resources/assets/src/js/skinlib/operations.js
+++ b/resources/assets/src/js/skinlib/operations.js
@@ -47,7 +47,7 @@ function ajaxAddToCloset(tid, name) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function removeFromCloset(tid) {
@@ -70,7 +70,7 @@ function removeFromCloset(tid) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function changeTextureName(tid, oldName) {
@@ -96,7 +96,7 @@ function changeTextureName(tid, oldName) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 /**
@@ -151,7 +151,7 @@ function changePrivacy(tid) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function deleteTexture(tid) {
@@ -172,7 +172,7 @@ function deleteTexture(tid) {
         } else {
             swal({ type: 'warning', html: msg });
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 if (typeof require !== 'undefined' && typeof module !== 'undefined') {
diff --git a/resources/assets/src/js/user/closet.js b/resources/assets/src/js/user/closet.js
index 56fd5685..5a144e9a 100644
--- a/resources/assets/src/js/user/closet.js
+++ b/resources/assets/src/js/user/closet.js
@@ -26,7 +26,7 @@ $(document).ready(function () {
                 page, $('input[name=q]').val()
             )
         }));
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 
     $('input[name=q]').on('input', debounce(() => {
         let category = $('#skin-category').hasClass('active') ? 'skin' : 'cape';
@@ -67,7 +67,7 @@ $('body').on('click', '.item-body', function () {
         } else if (cape != undefined) {
             $indicator.text(trans('general.cape'));
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 });
 
 $('body').on('click', '.category-switch', () => {
@@ -158,7 +158,7 @@ function reloadCloset(category, page, search) {
             currentPage: page,
             totalPages: total_pages
         });
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function renameClosetItem(tid, oldName) {
@@ -184,7 +184,7 @@ function renameClosetItem(tid, oldName) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function removeFromCloset(tid) {
@@ -214,7 +214,7 @@ function removeFromCloset(tid) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function setAsAvatar(tid) {
@@ -239,7 +239,7 @@ function setAsAvatar(tid) {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 if (typeof require !== 'undefined' && typeof module !== 'undefined') {
diff --git a/resources/assets/src/js/user/player.js b/resources/assets/src/js/user/player.js
index 6158972a..332dd4b5 100644
--- a/resources/assets/src/js/user/player.js
+++ b/resources/assets/src/js/user/player.js
@@ -17,7 +17,7 @@ $('body').on('click', '.player', function () {
         data: { pid: $(this).attr('pid'), preference: $(this).val() }
     }).then(({ errno, msg }) => {
         (errno == 0) ? toastr.success(msg) : toastr.warning(msg);
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 });
 
 function showPlayerTexturePreview(pid) {
@@ -48,7 +48,7 @@ function showPlayerTexturePreview(pid) {
 
         console.log(`Texture previews of player ${result.player_name} rendered.`);
 
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function changePlayerName(pid) {
@@ -77,7 +77,7 @@ function changePlayerName(pid) {
         } else {
             swal({ type: 'error', html: msg });
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function clearTexture(pid) {
@@ -122,7 +122,7 @@ function ajaxClearTexture(pid) {
     }).then(({ errno, msg }) => {
         swal({ type: errno == 0 ? 'success' : 'error', html: msg });
         $('.modal').modal('hide');
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function deletePlayer(pid) {
@@ -147,7 +147,7 @@ function deletePlayer(pid) {
         } else {
             swal({ type: 'error', html: msg });
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function addNewPlayer() {
@@ -167,7 +167,7 @@ function addNewPlayer() {
         } else {
             toastr.warning(msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function setTexture() {
@@ -200,7 +200,7 @@ function setTexture() {
             } else {
                 toastr.warning(msg);
             }
-        }).catch(err => showAjaxError(err));
+        }).catch(showAjaxError);
     }
 }
 
diff --git a/resources/assets/src/js/user/profile.js b/resources/assets/src/js/user/profile.js
index 1071b71d..94c6f7a1 100644
--- a/resources/assets/src/js/user/profile.js
+++ b/resources/assets/src/js/user/profile.js
@@ -27,7 +27,7 @@ function changeNickName() {
         } else {
             return swal({ type: 'warning', html: msg });
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function changePassword() {
@@ -67,11 +67,11 @@ function changePassword() {
                     if (errno == 0) {
                         window.location = url('auth/login');
                     }
-                }).catch(err => showAjaxError(err));
+                }).catch(showAjaxError);
             } else {
                 return swal({ type: 'warning', text: msg });
             }
-        }).catch(err => showAjaxError(err));
+        }).catch(showAjaxError);
     }
 }
 
@@ -117,11 +117,11 @@ function changeEmail() {
                 if (errno == 0) {
                     window.location = url('auth/login');
                 }
-            }).catch(err => showAjaxError(err));
+            }).catch(showAjaxError);
         } else {
             return swal({ type: 'warning', text: msg });
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 function deleteAccount() {
@@ -147,7 +147,7 @@ function deleteAccount() {
         } else {
             return swal({ type: 'warning', html: msg });
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 if (typeof require !== 'undefined' && typeof module !== 'undefined') {
diff --git a/resources/assets/src/js/user/sign.js b/resources/assets/src/js/user/sign.js
index 4235352a..2e59b42e 100644
--- a/resources/assets/src/js/user/sign.js
+++ b/resources/assets/src/js/user/sign.js
@@ -24,7 +24,7 @@ function sign() {
         } else {
             toastr.warning(result.msg);
         }
-    }).catch(err => showAjaxError(err));
+    }).catch(showAjaxError);
 }
 
 if (typeof require !== 'undefined' && typeof module !== 'undefined') {