diff --git a/jeeutil/src/main/java/de/muehlencord/shared/jeeutil/restexfw/APIExceptionInterceptor.java b/jeeutil/src/main/java/de/muehlencord/shared/jeeutil/restexfw/APIExceptionInterceptor.java
index 1890ab4..8945e2f 100644
--- a/jeeutil/src/main/java/de/muehlencord/shared/jeeutil/restexfw/APIExceptionInterceptor.java
+++ b/jeeutil/src/main/java/de/muehlencord/shared/jeeutil/restexfw/APIExceptionInterceptor.java
@@ -44,9 +44,9 @@ public class APIExceptionInterceptor {
                 errorResponse = ((APIException) ex).getHttpResponse();
             } else if (ex.getCause() instanceof APIException) {
                 errorResponse = ((APIException) ex.getCause()).getHttpResponse();
-//            } else if (ex instanceof ConstraintViolationException) {
+            } else if (ex instanceof ConstraintViolationException) {
                 // this exception is handled via the ConstraintViolationMapper
-//                throw (ConstraintViolationException) ex;
+                throw (ConstraintViolationException) ex;
             } else if (ex.getCause() instanceof ConstraintViolationException) {
                 // this exception is handled via the ConstraintViolationMapper
                 throw (ConstraintViolationException) ex.getCause();