diff --git a/addons/web/static/src/js/abstract_web_client.js b/addons/web/static/src/js/abstract_web_client.js
index 115a58a654f..8c82abf846c 100644
--- a/addons/web/static/src/js/abstract_web_client.js
+++ b/addons/web/static/src/js/abstract_web_client.js
@@ -120,12 +120,37 @@ var WebClient = Widget.extend({
         // crash manager integration
         session.on('error', crash_manager, crash_manager.rpc_error);
         window.onerror = function (message, file, line, col, error) {
-            var traceback = error ? error.stack : '';
-            crash_manager.show_error({
-                type: _t("Client Error"),
-                message: message,
-                data: {debug: file + ':' + line + "\n" + _t('Traceback:') + "\n" + traceback}
-            });
+            // Scripts injected in DOM (eg: google API's js files) won't return a clean error on window.onerror.
+            // The browser will just give you a 'Script error.' as message and nothing else for security issue.
+            // To enable onerror to work properly with CORS file, you should:
+            //   1. add crossorigin="anonymous" to your <script> tag loading the file
+            //   2. enabling 'Access-Control-Allow-Origin' on the server serving the file.
+            // Since in some case it wont be possible to to this, this handle should have the possibility to be
+            // handled by the script manipulating the injected file. For this, you will use window.onOriginError
+            // If it is not handled, we should display something clearer than the common crash_manager error dialog
+            // since it won't show anything except "Script error."
+            // This link will probably explain it better: https://blog.sentry.io/2016/05/17/what-is-script-error.html
+            if (!file && !line && !col) {
+                // Chrome and Opera set "Script error." on the `message` and hide the `error`
+                // Firefox handles the "Script error." directly. It sets the error thrown by the CORS file into `error`
+                if (window.onOriginError) {
+                    window.onOriginError();
+                    delete window.onOriginError;
+                } else {
+                    crash_manager.show_error({
+                        type: _t("Odoo Client Error"),
+                        message: _t("Unknown CORS error"),
+                        data: {debug: _t("An unknown CORS error occured. The error probably originates from a JavaScript file served from a different origin. (Opening your browser console might give you a hint on the error.)")},
+                    });
+                }
+            } else {
+                var traceback = error ? error.stack : '';
+                crash_manager.show_error({
+                    type: _t("Odoo Client Error"),
+                    message: message,
+                    data: {debug: file + ':' + line + "\n" + _t('Traceback:') + "\n" + traceback},
+                });
+            }
         };
     },
     set_action_manager: function() {
diff --git a/addons/website/static/src/js/website.backendDashboard.js b/addons/website/static/src/js/website.backendDashboard.js
index 5caad853fcf..df812a7db2c 100644
--- a/addons/website/static/src/js/website.backendDashboard.js
+++ b/addons/website/static/src/js/website.backendDashboard.js
@@ -174,6 +174,10 @@ var Dashboard = Widget.extend(ControlPanelMixin, {
             $analytics_components.empty();
             // 1. Authorize component
             var $analytics_auth = $('<div>').addClass('col-md-12');
+            window.onOriginError = function () {
+                $analytics_components.find('.js_unauthorized_message').remove();
+                self.display_unauthorized_message($analytics_components, 'not_initialized');
+            };
             gapi.analytics.auth.authorize({
                 container: $analytics_auth[0],
                 clientid: client_id
@@ -182,6 +186,7 @@ var Dashboard = Widget.extend(ControlPanelMixin, {
 
             self.handle_analytics_auth($analytics_components);
             gapi.analytics.auth.on('signIn', function() {
+                delete window.onOriginError;
                 self.handle_analytics_auth($analytics_components);
             });
 
diff --git a/addons/website/static/src/xml/website.backend.xml b/addons/website/static/src/xml/website.backend.xml
index e2f27f7de6e..55b16673d6d 100644
--- a/addons/website/static/src/xml/website.backend.xml
+++ b/addons/website/static/src/xml/website.backend.xml
@@ -38,6 +38,7 @@
     <div t-name="website.unauthorized_analytics" class="col-xs-12 js_unauthorized_message mb16">
         <span t-if="reason === 'not_connected'">You need to log in to your Google Account before: </span>
         <span t-if="reason === 'no_right'">You do not seem to have access to this Analytics Account.</span>
+        <span t-if="reason === 'not_initialized'">Google Analytics initialization failed. Maybe this domain is not whitelisted in your Google Analytics project for this client ID.</span>
     </div>
 
     <div t-name="website.ga_dialog_content">