diff --git a/src/org/kar/archidata/catcher/RestErrorResponse.java b/src/org/kar/archidata/catcher/RestErrorResponse.java
index cc26156..22db030 100644
--- a/src/org/kar/archidata/catcher/RestErrorResponse.java
+++ b/src/org/kar/archidata/catcher/RestErrorResponse.java
@@ -6,12 +6,15 @@ import java.util.List;
 import org.bson.types.ObjectId;
 import org.kar.archidata.annotation.apiGenerator.ApiGenerationMode;
 
+import com.fasterxml.jackson.annotation.JsonInclude;
+
 import jakarta.annotation.Nullable;
 import jakarta.persistence.Column;
 import jakarta.validation.constraints.NotNull;
 import jakarta.ws.rs.core.Response;
 
 @ApiGenerationMode
+@JsonInclude(JsonInclude.Include.NON_NULL)
 public class RestErrorResponse {
 	public ObjectId oid = new ObjectId();
 	@NotNull
diff --git a/src/org/kar/archidata/catcher/RestInputError.java b/src/org/kar/archidata/catcher/RestInputError.java
index 3e53a9c..5820054 100644
--- a/src/org/kar/archidata/catcher/RestInputError.java
+++ b/src/org/kar/archidata/catcher/RestInputError.java
@@ -3,10 +3,13 @@ package org.kar.archidata.catcher;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
+import com.fasterxml.jackson.annotation.JsonInclude;
+
 import jakarta.persistence.Column;
 import jakarta.validation.Path;
 import jakarta.validation.constraints.NotNull;
 
+@JsonInclude(JsonInclude.Include.NON_NULL)
 public class RestInputError {
 	private static Pattern PATTERN = Pattern.compile("^([^.]+)\\.([^.]+)(\\.(.*))?");
 	@Column(length = 0)