diff --git a/assets/js/src/ajax.js b/assets/js/src/ajax.js
index ed0994528f..aa1bd7068c 100644
--- a/assets/js/src/ajax.js
+++ b/assets/js/src/ajax.js
@@ -9,7 +9,7 @@ function requestFailed(errorMessage, xhr) {
         message: message
       }
     ]
-  }
+  };
 }
 
 define('ajax', ['mailpoet', 'jquery', 'underscore'], function(MailPoet, jQuery, _) {
@@ -50,7 +50,7 @@ define('ajax', ['mailpoet', 'jquery', 'underscore'], function(MailPoet, jQuery,
           endpoint: this.options.endpoint,
           method: this.options.action,
           data: this.options.data || {}
-        }
+        };
       },
       request: function(method, options) {
         // set options
@@ -62,8 +62,8 @@ define('ajax', ['mailpoet', 'jquery', 'underscore'], function(MailPoet, jQuery,
         // remove null values from the data object
         if (_.isObject(params.data)) {
           params.data = _.pick(params.data, function(value) {
-            return (value !== null)
-          })
+            return (value !== null);
+          });
         }
 
         // ajax request
diff --git a/assets/js/src/listing/listing.jsx b/assets/js/src/listing/listing.jsx
index 80ea01f5f7..5f7468fc9e 100644
--- a/assets/js/src/listing/listing.jsx
+++ b/assets/js/src/listing/listing.jsx
@@ -487,7 +487,7 @@ const Listing = React.createClass({
           }
         });
       }).fail((response) => {
-        if (response.errors.length > 0) {
+        if(response.errors.length > 0) {
           MailPoet.Notice.error(
             response.errors.map((error) => { return error.message; }),
             { scroll: true }
@@ -628,6 +628,13 @@ const Listing = React.createClass({
       data: data
     }).done(() => {
       this.getItems();
+    }).fail((response) => {
+      if(response.errors.length > 0) {
+        MailPoet.Notice.error(
+          response.errors.map((error) => { return error.message; }),
+          { scroll: true }
+        );
+      }
     });
   },
   handleSearch: function (search) {
diff --git a/assets/js/src/mp2migrator.js b/assets/js/src/mp2migrator.js
index 154f66a57e..ad2cc65d80 100644
--- a/assets/js/src/mp2migrator.js
+++ b/assets/js/src/mp2migrator.js
@@ -129,6 +129,15 @@ define('mp2migrator', ['mailpoet', 'jquery'], function(MailPoet, jQuery) {
         jQuery('#stop-import').removeAttr('disabled'); // Enable the button
         MailPoet.MP2Migrator.reactivateImportButton();
         MailPoet.MP2Migrator.updateDisplay(); // Get the latest information after the import was stopped
+      }).fail(function (response) {
+        if(response.errors.length > 0) {
+          MailPoet.Notice.error(
+            response.errors.map(function (error) {
+              return error.message;
+            }),
+            {scroll: true}
+          );
+        }
       });
       MailPoet.MP2Migrator.stopLogger();
       return false;
@@ -143,6 +152,15 @@ define('mp2migrator', ['mailpoet', 'jquery'], function(MailPoet, jQuery) {
         }
       }).done(function () {
         MailPoet.MP2Migrator.gotoWelcomePage();
+      }).fail(function (response) {
+        if(response.errors.length > 0) {
+          MailPoet.Notice.error(
+            response.errors.map(function (error) {
+              return error.message;
+            }),
+            {scroll: true}
+          );
+        }
       });
       return false;
     },
diff --git a/assets/js/src/newsletters/templates.jsx b/assets/js/src/newsletters/templates.jsx
index c49a68da15..83f5ee1b60 100644
--- a/assets/js/src/newsletters/templates.jsx
+++ b/assets/js/src/newsletters/templates.jsx
@@ -121,6 +121,13 @@ define(
               loading: false
             });
           }
+        }).fail((response) => {
+          if(response.errors.length > 0) {
+            MailPoet.Notice.error(
+              response.errors.map((error) => { return error.message; }),
+              { scroll: true }
+            );
+          }
         });
       },
       handleSelectTemplate: function (template) {
@@ -169,6 +176,13 @@ define(
             }
           }).done(() => {
             this.getTemplates();
+          }).fail((response) => {
+            if (response.errors.length > 0) {
+              MailPoet.Notice.error(
+                response.errors.map((error) => { return error.message; }),
+                { scroll: true }
+              );
+            }
           });
         } else {
            this.setState({ loading: false });
diff --git a/assets/js/src/segments/list.jsx b/assets/js/src/segments/list.jsx
index 56100a38cb..47a134681f 100644
--- a/assets/js/src/segments/list.jsx
+++ b/assets/js/src/segments/list.jsx
@@ -164,6 +164,14 @@ const item_actions = [
           );
           refresh();
         }
+      }).fail((response) => {
+        MailPoet.Modal.loading(false);
+        if(response.errors.length > 0) {
+          MailPoet.Notice.error(
+            response.errors.map((error) => { return error.message; }),
+            { scroll: true }
+          );
+        }
       });
     },
     display: function (segment) {
diff --git a/lib/Form/Widget.php b/lib/Form/Widget.php
index 7566b930ab..7ff49b4173 100644
--- a/lib/Form/Widget.php
+++ b/lib/Form/Widget.php
@@ -84,6 +84,13 @@ class Widget extends \WP_Widget {
             window.location =
               "<?php echo $form_edit_url; ?>" + response.data.id;
           }
+        }).fail((response) => {
+          if(response.errors.length > 0) {
+            MailPoet.Notice.error(
+              response.errors.map((error) => { return error.message; }),
+              { scroll: true }
+            );
+          }
         });
         return false;
     }
diff --git a/views/welcome.html b/views/welcome.html
index aa23c81bfd..cb80c8a807 100644
--- a/views/welcome.html
+++ b/views/welcome.html
@@ -124,6 +124,13 @@ jQuery(function($) {
           data: {
             analytics: { enabled: (is_enabled)}
           }
+        }).fail((response) => {
+          if (response.errors.length > 0) {
+            MailPoet.Notice.error(
+              response.errors.map((error) => { return error.message; }),
+              { scroll: true }
+            );
+          }
         });
 
         if (is_enabled) {