diff --git a/js/impact-pack.js b/js/impact-pack.js
index 7a46ffba..3fe37cae 100644
--- a/js/impact-pack.js
+++ b/js/impact-pack.js
@@ -573,7 +573,7 @@ app.registerExtension({
 					return;
 				}
 				else {
-					if(nodeData.name == 'ImpactSwitch' && app.graph._nodes_by_id[link_info.origin_id].type == 'Reroute')
+					if(nodeData.name == 'ImpactSwitch' && app.graph._nodes_by_id[link_info.origin_id]?.type == 'Reroute')
 						this.disconnectInput(link_info.target_slot);
 
 					// connect input
@@ -582,26 +582,30 @@ app.registerExtension({
 
 					if(this.inputs[0].type == '*'){
 						const node = app.graph.getNodeById(link_info.origin_id);
-						let origin_type = node.outputs[link_info.origin_slot]?.type;
-						if(link_info.target_slot == 0 && this.inputs.length > 3) {  // NOTE: widgets are regarded as input since new front
-								origin_type = this.inputs[1].type;
-								node.connect(link_info.origin_slot, node.id, 'input1');
-						}
-						
-						if(origin_type == '*' && app.graph.getNodeById(link_info.origin_id).slots[link_info.origin_slot].type != '*') {
-							this.disconnectInput(link_info.target_slot);
-							return;
-						}
 
-						for(let i in this.inputs) {
-							let input_i = this.inputs[i];
-							if(input_i.name != 'select' && input_i.name != 'sel_mode')
-								input_i.type = origin_type;
-						}
+						// NOTE: node is undefined when subgraph editing mode
+						if(node) {
+							let origin_type = node.outputs[link_info.origin_slot]?.type;
+							if(link_info.target_slot == 0 && this.inputs.length > 3) {  // NOTE: widgets are regarded as input since new front
+									origin_type = this.inputs[1].type;
+									node.connect(link_info.origin_slot, node.id, 'input1');
+							}
 
-						this.outputs[0].type = origin_type;
-						this.outputs[0].label = origin_type;
-						this.outputs[0].name = origin_type;
+							if(origin_type == '*' && app.graph.getNodeById(link_info.origin_id).slots[link_info.origin_slot].type != '*') {
+								this.disconnectInput(link_info.target_slot);
+								return;
+							}
+
+							for(let i in this.inputs) {
+								let input_i = this.inputs[i];
+								if(input_i.name != 'select' && input_i.name != 'sel_mode')
+									input_i.type = origin_type;
+							}
+
+							this.outputs[0].type = origin_type;
+							this.outputs[0].label = origin_type;
+							this.outputs[0].name = origin_type;
+						}
 					}
 				}