diff --git a/lib/amd/build/ajax.min.js b/lib/amd/build/ajax.min.js
index 3af51d68cd9..79cd16a1da9 100644
--- a/lib/amd/build/ajax.min.js
+++ b/lib/amd/build/ajax.min.js
@@ -1 +1 @@
-define(["jquery","core/config"],function(a,b){var c=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)},d=function(a,b){var c=this,d=0;for(d=0;d<c.length;d++){var e=c[d];"undefined"!=typeof e.fail&&e.deferred.reject(b)}};return{call:function(e,f,g){var h,i=[],j=[];for("undefined"==typeof g&&(g=!0),"undefined"==typeof f&&(f=!0),h=0;h<e.length;h++){var k=e[h];i.push({index:h,methodname:k.methodname,args:k.args}),k.deferred=a.Deferred(),j.push(k.deferred.promise()),"undefined"!=typeof k.done&&k.deferred.done(k.done),"undefined"!=typeof k.fail&&k.deferred.fail(k.fail),k.index=h}i=JSON.stringify(i);var l={type:"POST",data:i,context:e,dataType:"json",processData:!1,async:f,contentType:"application/json"},m=b.wwwroot+"/lib/ajax/service.php?sesskey="+b.sesskey;return g||(m=b.wwwroot+"/lib/ajax/service-nologin.php?sesskey="+b.sesskey),f?a.ajax(m,l).done(c).fail(d):(l.success=c,l.error=d,a.ajax(m,l)),j}}});
\ No newline at end of file
+define(["jquery","core/config"],function(a,b){var c=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)},d=function(a,b){var c=this,d=0;for(d=0;d<c.length;d++){var e=c[d];e.deferred.reject(b)}};return{call:function(e,f,g){var h,i=[],j=[];for("undefined"==typeof g&&(g=!0),"undefined"==typeof f&&(f=!0),h=0;h<e.length;h++){var k=e[h];i.push({index:h,methodname:k.methodname,args:k.args}),k.deferred=a.Deferred(),j.push(k.deferred.promise()),"undefined"!=typeof k.done&&k.deferred.done(k.done),"undefined"!=typeof k.fail&&k.deferred.fail(k.fail),k.index=h}i=JSON.stringify(i);var l={type:"POST",data:i,context:e,dataType:"json",processData:!1,async:f,contentType:"application/json"},m=b.wwwroot+"/lib/ajax/service.php?sesskey="+b.sesskey;return g||(m=b.wwwroot+"/lib/ajax/service-nologin.php?sesskey="+b.sesskey),f?a.ajax(m,l).done(c).fail(d):(l.success=c,l.error=d,a.ajax(m,l)),j}}});
\ No newline at end of file
diff --git a/lib/amd/build/str.min.js b/lib/amd/build/str.min.js
index e2d06e48584..48aff1496dc 100644
--- a/lib/amd/build/str.min.js
+++ b/lib/amd/build/str.min.js
@@ -1 +1 @@
-define(["jquery","core/ajax","core/localstorage"],function(a,b,c){var d=[];return{get_string:function(a,b,c,d){var e=this.get_strings([{key:a,component:b,param:c,lang:d}]);return e.then(function(a){return a[0]})},get_strings:function(e){var f,g=a.Deferred(),h=[],i=0,j=!1;for(i=0;i<e.length;i++)if(f=e[i],"undefined"==typeof f.lang&&(f.lang=a("html").attr("lang").replace("-","_")),f.cacheKey="core_str/"+f.key+"/"+f.component+"/"+f.lang,"undefined"==typeof M.str[f.component]||"undefined"==typeof M.str[f.component][f.key]){var k=c.get(f.cacheKey);k?("undefined"==typeof M.str[f.component]&&(M.str[f.component]=[]),M.str[f.component][f.key]=k):j=!0}if(j){var l=[],m=[],n=function(a){this.resolve(a)};for(i=0;i<e.length;i++)if(f=e[i],"undefined"!=typeof d[f.cacheKey])m.push(d[f.cacheKey]);else{var o=a.Deferred();l.push({methodname:"core_get_string",args:{stringid:f.key,component:f.component,lang:f.lang,stringparams:[]},done:n.bind(o)}),d[f.cacheKey]=o.promise(),m.push(d[f.cacheKey])}l.length>0&&b.call(l,!0,!1),a.when.apply(null,m).done(function(){var a=0;for(a=0;a<arguments.length;a++)f=e[a],"undefined"==typeof M.str[f.component]&&(M.str[f.component]=[]),M.str[f.component][f.key]=arguments[a],c.set("core_str/"+f.key+"/"+f.component+"/"+f.lang,arguments[a]),h[a]=M.util.get_string(f.key,f.component,f.param).trim();g.resolve(h)}).fail(function(a){g.reject(a)})}else{for(i=0;i<e.length;i++)f=e[i],h[i]=M.util.get_string(f.key,f.component,f.param);g.resolve(h)}return g.promise()}}});
\ No newline at end of file
+define(["jquery","core/ajax","core/localstorage"],function(a,b,c){var d=[];return{get_string:function(a,b,c,d){var e=this.get_strings([{key:a,component:b,param:c,lang:d}]);return e.then(function(a){return a[0]})},get_strings:function(e){var f,g=a.Deferred(),h=[],i=0,j=!1;for(i=0;i<e.length;i++)if(f=e[i],"undefined"==typeof f.lang&&(f.lang=a("html").attr("lang").replace("-","_")),f.cacheKey="core_str/"+f.key+"/"+f.component+"/"+f.lang,"undefined"==typeof M.str[f.component]||"undefined"==typeof M.str[f.component][f.key]){var k=c.get(f.cacheKey);k?("undefined"==typeof M.str[f.component]&&(M.str[f.component]=[]),M.str[f.component][f.key]=k):j=!0}if(j){var l=[],m=[],n=function(a){this.resolve(a)},o=function(a){this.reject(a)};for(i=0;i<e.length;i++)if(f=e[i],"undefined"!=typeof d[f.cacheKey])m.push(d[f.cacheKey]);else{var p=a.Deferred();l.push({methodname:"core_get_string",args:{stringid:f.key,component:f.component,lang:f.lang,stringparams:[]},done:n.bind(p),fail:o.bind(p)}),d[f.cacheKey]=p.promise(),m.push(d[f.cacheKey])}l.length>0&&b.call(l,!0,!1),a.when.apply(null,m).done(function(){var a=0;for(a=0;a<arguments.length;a++)f=e[a],"undefined"==typeof M.str[f.component]&&(M.str[f.component]=[]),M.str[f.component][f.key]=arguments[a],c.set("core_str/"+f.key+"/"+f.component+"/"+f.lang,arguments[a]),h[a]=M.util.get_string(f.key,f.component,f.param).trim();g.resolve(h)}).fail(function(a){g.reject(a)})}else{for(i=0;i<e.length;i++)f=e[i],h[i]=M.util.get_string(f.key,f.component,f.param);g.resolve(h)}return g.promise()}}});
\ No newline at end of file
diff --git a/lib/amd/src/ajax.js b/lib/amd/src/ajax.js
index 7c56b36b40d..b2afb6baeef 100644
--- a/lib/amd/src/ajax.js
+++ b/lib/amd/src/ajax.js
@@ -87,9 +87,7 @@ define(['jquery', 'core/config'], function($, config) {
         for (i = 0; i < requests.length; i++) {
             var request = requests[i];
 
-            if (typeof request.fail != "undefined") {
-                request.deferred.reject(textStatus);
-            }
+            request.deferred.reject(textStatus);
         }
     };
 
diff --git a/lib/amd/src/str.js b/lib/amd/src/str.js
index 6e9407b277c..1ef76234ddc 100644
--- a/lib/amd/src/str.js
+++ b/lib/amd/src/str.js
@@ -115,6 +115,10 @@ define(['jquery', 'core/ajax', 'core/localstorage'], function($, ajax, storage)
                     this.resolve(str);
                 };
 
+                var failFunc = function(reason) {
+                    this.reject(reason);
+                };
+
                 for (i = 0; i < requests.length; i++) {
                     request = requests[i];
 
@@ -133,7 +137,8 @@ define(['jquery', 'core/ajax', 'core/localstorage'], function($, ajax, storage)
                                 lang: request.lang,
                                 stringparams: []
                             },
-                            done: doneFunc.bind(fetchpromise)
+                            done: doneFunc.bind(fetchpromise),
+                            fail: failFunc.bind(fetchpromise)
                         });
 
                         promiseCache[request.cacheKey] = fetchpromise.promise();