diff --git a/lib/amd/build/ajax.min.js b/lib/amd/build/ajax.min.js
index 96fcee8fbe6..8247f327b0c 100644
--- a/lib/amd/build/ajax.min.js
+++ b/lib/amd/build/ajax.min.js
@@ -1 +1 @@
-define(["jquery","core/config","core/log"],function(a,b,c){var d=!1,e=function(a){var b,c,d=this,e=null,f=0;for(f=0;f<d.length;f++){if(b=d[f],c=a[f],"undefined"==typeof c){e=new Error("missing response");break}if(c.error!==!1){e=c.exception;break}b.deferred.resolve(c.data)}if(null!==e)for(;f<d.length;f++)b=d[f],b.deferred.reject(e)},f=function(a,b){var e=this,f=0;for(f=0;f<e.length;f++){var g=e[f];d?c.error("Page unload: "+b):g.deferred.reject(b)}};return{call:function(c,g,h){a(window).bind("beforeunload",function(){d=!0});var i,j=[],k=[],l=[],m="";for("undefined"==typeof h&&(h=!0),"undefined"==typeof g&&(g=!0),i=0;i<c.length;i++){var n=c[i];j.push({index:i,methodname:n.methodname,args:n.args}),n.deferred=a.Deferred(),k.push(n.deferred.promise()),"undefined"!=typeof n.done&&n.deferred.done(n.done),"undefined"!=typeof n.fail&&n.deferred.fail(n.fail),n.index=i,l.push(n.methodname)}m=l.length<=5?l.sort().join():l.length+"-method-calls",j=JSON.stringify(j);var o={type:"POST",data:j,context:c,dataType:"json",processData:!1,async:g,contentType:"application/json"},p="service.php";h||(p="service-nologin.php");var q=b.wwwroot+"/lib/ajax/"+p+"?sesskey="+b.sesskey+"&info="+m;return g?a.ajax(q,o).done(e).fail(f):(o.success=e,o.error=f,a.ajax(q,o)),k}}});
\ No newline at end of file
+define(["jquery","core/config","core/log"],function(a,b,c){var d=!1,e=function(a){var b,c,d=this,e=null,f=0;if(a.error)for(;f<d.length;f++)b=d[f],b.deferred.reject(a);else{for(f=0;f<d.length;f++){if(b=d[f],c=a[f],"undefined"==typeof c){e=new Error("missing response");break}if(c.error!==!1){e=c.exception;break}b.deferred.resolve(c.data)}if(null!==e)for(;f<d.length;f++)b=d[f],b.deferred.reject(e)}},f=function(a,b,e){var f=this,g=0;for(g=0;g<f.length;g++){var h=f[g];d?(c.error("Page unloaded."),c.error(e)):h.deferred.reject(e)}};return{call:function(c,g,h){a(window).bind("beforeunload",function(){d=!0});var i,j=[],k=[],l=[],m="";for("undefined"==typeof h&&(h=!0),"undefined"==typeof g&&(g=!0),i=0;i<c.length;i++){var n=c[i];j.push({index:i,methodname:n.methodname,args:n.args}),n.deferred=a.Deferred(),k.push(n.deferred.promise()),"undefined"!=typeof n.done&&n.deferred.done(n.done),"undefined"!=typeof n.fail&&n.deferred.fail(n.fail),n.index=i,l.push(n.methodname)}m=l.length<=5?l.sort().join():l.length+"-method-calls",j=JSON.stringify(j);var o={type:"POST",data:j,context:c,dataType:"json",processData:!1,async:g,contentType:"application/json"},p="service.php";h||(p="service-nologin.php");var q=b.wwwroot+"/lib/ajax/"+p+"?sesskey="+b.sesskey+"&info="+m;return g?a.ajax(q,o).done(e).fail(f):(o.success=e,o.error=f,a.ajax(q,o)),k}}});
\ No newline at end of file
diff --git a/lib/amd/src/ajax.js b/lib/amd/src/ajax.js
index b0267a87a25..481247ce8ec 100644
--- a/lib/amd/src/ajax.js
+++ b/lib/amd/src/ajax.js
@@ -46,6 +46,18 @@ define(['jquery', 'core/config', 'core/log'], function($, config, Log) {
         var request;
         var response;
 
+        if (responses.error) {
+            // There was an error with the request as a whole.
+            // We need to reject each promise.
+            // Unfortunately this may lead to duplicate dialogues, but each Promise must be rejected.
+            for (; i < requests.length; i++) {
+                request = requests[i];
+                request.deferred.reject(responses);
+            }
+
+            return;
+        }
+
         for (i = 0; i < requests.length; i++) {
             request = requests[i];
 
@@ -81,8 +93,9 @@ define(['jquery', 'core/config', 'core/log'], function($, config, Log) {
      * @private
      * @param {jqXHR} jqXHR The ajax object.
      * @param {string} textStatus The status string.
+     * @param {Error|Object} exception The error thrown.
      */
-    var requestFail = function(jqXHR, textStatus) {
+    var requestFail = function(jqXHR, textStatus, exception) {
         // Reject all the promises.
         var requests = this;
 
@@ -92,9 +105,10 @@ define(['jquery', 'core/config', 'core/log'], function($, config, Log) {
 
             if (unloading) {
                 // No need to trigger an error because we are already navigating.
-                Log.error("Page unload: " + textStatus);
+                Log.error("Page unloaded.");
+                Log.error(exception);
             } else {
-                request.deferred.reject(textStatus);
+                request.deferred.reject(exception);
             }
         }
     };