diff --git a/app/coffee/modules/issues/detail.coffee b/app/coffee/modules/issues/detail.coffee
index 329e5244..22bcbe9e 100644
--- a/app/coffee/modules/issues/detail.coffee
+++ b/app/coffee/modules/issues/detail.coffee
@@ -127,14 +127,14 @@ class IssueDetailController extends mixOf(taiga.Controller, taiga.PageMixin)
             @scope.issueId = issue.id
             @scope.commentModel = issue
 
-            if @scope.issue.neighbors.previous.ref?
+            if @scope.issue.neighbors.previous?.ref?
                 ctx = {
                     project: @scope.project.slug
                     ref: @scope.issue.neighbors.previous.ref
                 }
                 @scope.previousUrl = @navUrls.resolve("project-issues-detail", ctx)
 
-            if @scope.issue.neighbors.next.ref?
+            if @scope.issue.neighbors.next?.ref?
                 ctx = {
                     project: @scope.project.slug
                     ref: @scope.issue.neighbors.next.ref
diff --git a/app/coffee/modules/tasks/detail.coffee b/app/coffee/modules/tasks/detail.coffee
index 9a2ebc74..96bb59d7 100644
--- a/app/coffee/modules/tasks/detail.coffee
+++ b/app/coffee/modules/tasks/detail.coffee
@@ -115,14 +115,14 @@ class TaskDetailController extends mixOf(taiga.Controller, taiga.PageMixin)
             @scope.taskId = task.id
             @scope.commentModel = task
 
-            if @scope.task.neighbors.previous.ref?
+            if @scope.task.neighbors.previous?.ref?
                 ctx = {
                     project: @scope.project.slug
                     ref: @scope.task.neighbors.previous.ref
                 }
                 @scope.previousUrl = @navUrls.resolve("project-tasks-detail", ctx)
 
-            if @scope.task.neighbors.next.ref?
+            if @scope.task.neighbors.next?.ref?
                 ctx = {
                     project: @scope.project.slug
                     ref: @scope.task.neighbors.next.ref
diff --git a/app/coffee/modules/userstories/detail.coffee b/app/coffee/modules/userstories/detail.coffee
index ec638afe..fb25ed57 100644
--- a/app/coffee/modules/userstories/detail.coffee
+++ b/app/coffee/modules/userstories/detail.coffee
@@ -152,14 +152,14 @@ class UserStoryDetailController extends mixOf(taiga.Controller, taiga.PageMixin)
             @scope.usId = us.id
             @scope.commentModel = us
 
-            if @scope.us.neighbors.previous.ref?
+            if @scope.us.neighbors.previous?.ref?
                 ctx = {
                     project: @scope.project.slug
                     ref: @scope.us.neighbors.previous.ref
                 }
                 @scope.previousUrl = @navUrls.resolve("project-userstories-detail", ctx)
 
-            if @scope.us.neighbors.next.ref?
+            if @scope.us.neighbors.next?.ref?
                 ctx = {
                     project: @scope.project.slug
                     ref: @scope.us.neighbors.next.ref