diff --git a/packages/node_modules/@node-red/nodes/core/logic/17-split.js b/packages/node_modules/@node-red/nodes/core/logic/17-split.js
index ec879c253..c644b9e36 100644
--- a/packages/node_modules/@node-red/nodes/core/logic/17-split.js
+++ b/packages/node_modules/@node-red/nodes/core/logic/17-split.js
@@ -628,7 +628,9 @@ module.exports = function(RED) {
 
                 var group = inflight[partId];
                 if (payloadType === 'buffer') {
-                    inflight[partId].bufferLen += property.length;
+                    if (property !== undefined) {
+                        inflight[partId].bufferLen += property.length;
+                    }
                 }
                 if (payloadType === 'object') {
                     group.payload[propertyKey] = property;