diff --git a/core/apps/shared/views/usd_course.py b/core/apps/shared/views/usd_course.py
index 47d3fb3..5404d76 100644
--- a/core/apps/shared/views/usd_course.py
+++ b/core/apps/shared/views/usd_course.py
@@ -21,7 +21,7 @@ class UsdCourseApiView(generics.GenericAPIView):
     def patch(self, request):
         usd_cource = UsdCourse.objects.first()
         serializer = self.serializer_class(data=request.data)
-        if serializer.is_valid():
+        if not serializer.is_valid():
             return Response(serializer.errors, status=400)
         value = serializer.validated_data.get('value')
         usd_cource.value = value