diff --git a/src/org/redkale/convert/DeMember.java b/src/org/redkale/convert/DeMember.java
index e6acf6d03..84e79ab56 100644
--- a/src/org/redkale/convert/DeMember.java
+++ b/src/org/redkale/convert/DeMember.java
@@ -83,6 +83,7 @@ public final class DeMember<R extends Reader, T, F> {
     public int compareTo(boolean fieldSort, DeMember<R, T, F> o) {
         if (o == null) return -1;
         if (this.index != o.index) return (this.index == 0 ? Integer.MAX_VALUE : this.index) - (o.index == 0 ? Integer.MAX_VALUE : o.index);
+        if (this.index != 0) throw new RuntimeException("fields (" + attribute.field() + ", " + o.attribute.field() + ") have same ConvertColumn.index(" + this.index + ") in " + attribute.declaringClass());
         return fieldSort ? this.attribute.field().compareTo(o.attribute.field()) : 0;
     }
 
diff --git a/src/org/redkale/convert/EnMember.java b/src/org/redkale/convert/EnMember.java
index cc9dc77ad..e09d7886b 100644
--- a/src/org/redkale/convert/EnMember.java
+++ b/src/org/redkale/convert/EnMember.java
@@ -76,6 +76,7 @@ public final class EnMember<W extends Writer, T, F> {
     public int compareTo(boolean fieldSort, EnMember<W, T, F> o) {
         if (o == null) return -1;
         if (this.index != o.index) return (this.index == 0 ? Integer.MAX_VALUE : this.index) - (o.index == 0 ? Integer.MAX_VALUE : o.index);
+        if (this.index != 0) throw new RuntimeException("fields (" + attribute.field() + ", " + o.attribute.field() + ") have same ConvertColumn.index(" + this.index + ") in " + attribute.declaringClass());
         return fieldSort ? this.attribute.field().compareTo(o.attribute.field()) : 0;
     }