diff --git a/addons/web/http.py b/addons/web/http.py
index 7a1c1bcb4af..663acee9ebc 100644
--- a/addons/web/http.py
+++ b/addons/web/http.py
@@ -232,12 +232,21 @@ class JsonRequest(WebRequest):
         return r
 
 def serialize_exception(e):
-    return {
+    tmp = {
         "name": type(e).__module__ + "." + type(e).__name__ if type(e).__module__ else type(e).__name__,
         "debug": traceback.format_exc(),
         "message": u"%s" % e,
         "arguments": to_jsonable(e.args),
     }
+    if isinstance(e, openerp.osv.osv.except_osv):
+        tmp["exception_type"] = "except_osv"
+    elif isinstance(e, openerp.exceptions.Warning):
+        tmp["exception_type"] = "warning"
+    elif isinstance(e, openerp.exceptions.AccessError):
+        tmp["exception_type"] = "access_error"
+    elif isinstance(e, openerp.exceptions.AccessDenied):
+        tmp["exception_type"] = "access_denied"
+    return tmp
 
 def to_jsonable(o):
     if isinstance(o, str) or isinstance(o,unicode) or isinstance(o, int) or isinstance(o, long) \
diff --git a/addons/web/static/src/js/chrome.js b/addons/web/static/src/js/chrome.js
index f2de7e61eab..bdc1dd4c02c 100644
--- a/addons/web/static/src/js/chrome.js
+++ b/addons/web/static/src/js/chrome.js
@@ -247,19 +247,12 @@ instance.web.CrashManager = instance.web.Class.extend({
         if (!this.active) {
             return;
         }
-        // yes, exception handling is shitty
-        if (error.code === 300 && error.data && error.data.type == "client_exception" && error.data.debug.match("SessionExpiredException")) {
-            this.show_warning({type: "Session Expired", data: { fault_code: "Your OpenERP session expired. Please refresh the current web page." }});
+        if (error.data.name === "openerp.addons.web.session SessionExpiredException") {
+            this.show_warning({type: "Session Expired", data: { message: "Your OpenERP session expired. Please refresh the current web page." }});
             return;
         }
-        if (error.data.fault_code) {
-            var split = ("" + error.data.fault_code).split('\n')[0].split(' -- ');
-            if (split.length > 1) {
-                error.type = split.shift();
-                error.data.fault_code = error.data.fault_code.substr(error.type.length + 4);
-            }
-        }
-        if (error.code === 200 && error.type) {
+        if (error.data.exception_type === "except_osv" || error.data.exception_type === "warning"
+                || error.data.exception_type === "access_error") {
             this.show_warning(error);
         } else {
             this.show_error(error);
@@ -269,8 +262,11 @@ instance.web.CrashManager = instance.web.Class.extend({
         if (!this.active) {
             return;
         }
+        if (error.data.exception_type === "except_osv") {
+            error = _.extend({}, error, {data: _.extend({}, error.data, {message: error.data.arguments[0] + "\n\n" + error.data.arguments[1]})});
+        }
         instance.web.dialog($('<div>' + QWeb.render('CrashManager.warning', {error: error}) + '</div>'), {
-            title: "OpenERP " + _.str.capitalize(error.type),
+            title: "OpenERP " + (_.str.capitalize(error.type) || "Warning"),
             buttons: [
                 {text: _t("Ok"), click: function() { $(this).dialog("close"); }}
             ]
@@ -650,7 +646,7 @@ instance.web.Login =  instance.web.Widget.extend({
         }
     },
     on_db_failed: function (error, event) {
-        if (error.data.fault_code === 'AccessDenied') {
+        if (error.data.name === 'openerp.exceptions.AccessDenied') {
             event.preventDefault();
         }
     },
diff --git a/addons/web/static/src/js/test_support.js b/addons/web/static/src/js/test_support.js
index 90173f89845..82c1d6fa26e 100644
--- a/addons/web/static/src/js/test_support.js
+++ b/addons/web/static/src/js/test_support.js
@@ -72,7 +72,7 @@ openerp.test_support = {
                 }
                 return;
             }
-            fn(e.data.fault_code);
+            fn(e.data.name);
         })
     }
 };
diff --git a/addons/web/static/src/xml/base.xml b/addons/web/static/src/xml/base.xml
index 7579eb9a55f..7604814fe1d 100644
--- a/addons/web/static/src/xml/base.xml
+++ b/addons/web/static/src/xml/base.xml
@@ -40,7 +40,7 @@
         <td>
             <p>
                 <t t-js="d">
-                    var message = d.message ? d.message : d.error.data.fault_code;
+                    var message = d.message ? d.message : d.error.data.message;
                     d.html_error = context.engine.tools.html_escape(message)
                         .replace(/\n/g, '<br/>');
                 </t>
diff --git a/addons/web_kanban/static/src/js/kanban.js b/addons/web_kanban/static/src/js/kanban.js
index 0ced5bcef2d..7d6f88b6def 100644
--- a/addons/web_kanban/static/src/js/kanban.js
+++ b/addons/web_kanban/static/src/js/kanban.js
@@ -415,7 +415,7 @@ instance.web_kanban.KanbanView = instance.web.View.extend({
                 new_group.do_save_sequences();
             }).fail(function(error, evt) {
                 evt.preventDefault();
-                alert(_t("An error has occured while moving the record to this group: ") + data.fault_code);
+                alert(_t("An error has occured while moving the record to this group: ") + data.message);
                 self.do_reload(); // TODO: use draggable + sortable in order to cancel the dragging when the rcp fails
             });
         }