diff --git a/internal/util/flowgraph/node.go b/internal/util/flowgraph/node.go
index 04d174b69a5e731a56dd045367bf2062c451eaba..abbc3c73b029cdabaacbb015e385bf5446e65fd3 100644
--- a/internal/util/flowgraph/node.go
+++ b/internal/util/flowgraph/node.go
@@ -68,9 +68,8 @@ func (nodeCtx *nodeCtx) work() {
 			return
 		default:
 			// inputs from inputsMessages for Operate
-			inputs := make([]Msg, 0)
 
-			var res []Msg
+			var inputs, res []Msg
 			if !nodeCtx.node.IsInputNode() {
 				nodeCtx.collectInputMessages()
 				inputs = nodeCtx.inputMessages