diff --git a/SchoolAgainStudy/StudentWebClient/Controllers/HomeController.cs b/SchoolAgainStudy/StudentWebClient/Controllers/HomeController.cs
index 098c9d0..3fc66cb 100644
--- a/SchoolAgainStudy/StudentWebClient/Controllers/HomeController.cs
+++ b/SchoolAgainStudy/StudentWebClient/Controllers/HomeController.cs
@@ -259,6 +259,8 @@ namespace StudentWebClient.Controllers
             {
                 throw new Exception("Введите название и описане");
             }
+            if(interests.Length == 0)
+                throw new Exception("Выберите интересы");
             Dictionary<int, IInterest> diyInterests = new Dictionary<int, IInterest>();
             foreach(int id in interests)
             {
@@ -309,7 +311,9 @@ namespace StudentWebClient.Controllers
             {
                 throw new Exception("Нет задания");
             }
-            
+            if (interests.Length == 0)
+                throw new Exception("Выберите интересы");
+
 
             Dictionary<int, IInterest> diyInterests = new Dictionary<int, IInterest>();
             foreach (int id in interests)
@@ -369,6 +373,8 @@ namespace StudentWebClient.Controllers
             {
                 throw new Exception("Введите название и описане");
             }
+            if (interests.Length == 0)
+                throw new Exception("Выберите интересы");
             Dictionary<int, IInterest> productInterests = new Dictionary<int, IInterest>();
             foreach (int id in interests)
             {
@@ -412,7 +418,8 @@ namespace StudentWebClient.Controllers
             {
                 throw new Exception("Нет даты");
             }
-            
+            if (interests.Length == 0)
+                throw new Exception("Выберите интересы");
 
             Dictionary<int, IInterest> productInterests = new Dictionary<int, IInterest>();
             foreach (int id in interests)
diff --git a/SchoolAgainStudy/TeacherWebClient/Controllers/HomeController.cs b/SchoolAgainStudy/TeacherWebClient/Controllers/HomeController.cs
index 77aa178..8da7bf6 100644
--- a/SchoolAgainStudy/TeacherWebClient/Controllers/HomeController.cs
+++ b/SchoolAgainStudy/TeacherWebClient/Controllers/HomeController.cs
@@ -252,11 +252,15 @@ namespace TeacherWebClient.Controllers
 			{
 				throw new Exception("Введите название и дату");
 			}
-			Dictionary<int, IMaterial> lessonMaterials = new Dictionary<int, IMaterial>();
+            if (materials.Length == 0)
+                throw new Exception("Выберите материалы");
+
+            Dictionary<int, IMaterial> lessonMaterials = new Dictionary<int, IMaterial>();
 			foreach (int id in materials)
 			{
 				lessonMaterials.Add(id, _material.ReadElement(new MaterialSearchModel { Id = id }));
 			}
+
 			_lesson.Create(new LessonBindingModel
 			{
 				TeacherId = APIClient.Teacher.Id,
@@ -297,8 +301,10 @@ namespace TeacherWebClient.Controllers
 			{
 				throw new Exception("Нет изделия");
 			}
+            if (materials.Length == 0)
+                throw new Exception("Выберите материалы");
 
-			Dictionary<int, IMaterial> lessonMaterials = new Dictionary<int, IMaterial>();
+            Dictionary<int, IMaterial> lessonMaterials = new Dictionary<int, IMaterial>();
 			foreach (int id in materials)
 			{
 				lessonMaterials.Add(id, _material.ReadElement(new MaterialSearchModel { Id = id }));
@@ -359,7 +365,10 @@ namespace TeacherWebClient.Controllers
 			{
 				throw new Exception("Дата выдачи должна быть раньше срока сдачи");
 			}
-			Dictionary<int, IMaterial> taskMaterials = new Dictionary<int, IMaterial>();
+            if (materials.Length == 0)
+                throw new Exception("Выберите материалы");
+
+            Dictionary<int, IMaterial> taskMaterials = new Dictionary<int, IMaterial>();
 			foreach (int id in materials)
 			{
 				taskMaterials.Add(id, _material.ReadElement(new MaterialSearchModel { Id = id }));
@@ -406,8 +415,10 @@ namespace TeacherWebClient.Controllers
 			{
 				throw new Exception("Дата выдачи должна быть раньше срока сдачи");
 			}
+            if (materials.Length == 0)
+                throw new Exception("Выберите материалы");
 
-			Dictionary<int, IMaterial> taskMaterials = new Dictionary<int, IMaterial>();
+            Dictionary<int, IMaterial> taskMaterials = new Dictionary<int, IMaterial>();
 			foreach (int id in materials)
 			{
 				taskMaterials.Add(id, _material.ReadElement(new MaterialSearchModel { Id = id }));