diff --git a/src/main/java/com/eactive/eai/message/StandardItem.java b/src/main/java/com/eactive/eai/message/StandardItem.java
index f8a74ab..cf750fd 100644
--- a/src/main/java/com/eactive/eai/message/StandardItem.java
+++ b/src/main/java/com/eactive/eai/message/StandardItem.java
@@ -783,12 +783,15 @@ public class StandardItem implements Serializable, Cloneable {
 				if(p>0) sb.append(",");
 				sb.append("{");
 				while(keyIter.hasNext()) {
-					if(ai>0) sb.append(",");
 					String key = keyIter.next();
 					StandardItem item = group.get(key);
-					if(showPretty) sb.append("\n");
-					sb.append(item.toJson(showPretty, withBizData));
-					ai++;
+					String itemPart = item.toJson(showPretty, withBizData);
+					if(StringUtils.isNotEmpty(itemPart)) {
+						if(ai>0) sb.append(",");
+						if(showPretty) sb.append("\n");
+						sb.append(itemPart);
+						ai++;
+					}
 				}
 				
 				if(showPretty) {