diff --git a/web/scripts/app.js b/web/scripts/app.js
index a687eb5c..695d4a5d 100644
--- a/web/scripts/app.js
+++ b/web/scripts/app.js
@@ -864,9 +864,15 @@ class ComfyApp {
 			graphData = structuredClone(defaultGraph);
 		}
 
-		// Patch T2IAdapterLoader to ControlNetLoader since they are the same node now
+		let missingNodeTypes = [];
 		for (let n of graphData.nodes) {
+			// Patch T2IAdapterLoader to ControlNetLoader since they are the same node now
 			if (n.type == "T2IAdapterLoader") n.type = "ControlNetLoader";
+
+			// Find missing node types
+			if (!(n.type in LiteGraph.registered_node_types)) {
+				missingNodeTypes.push(n.type);
+			}
 		}
 
 		this.graph.configure(graphData);
@@ -893,6 +899,14 @@ class ComfyApp {
 
 			this.#invokeExtensions("loadedGraphNode", node);
 		}
+
+		if (missingNodeTypes.length) {
+			this.ui.dialog.show(
+				`When loading the graph, the following node types were not found: <ul>${missingNodeTypes.map(
+					(t) => `<li>${t}</li>`
+				)}</ul>Nodes that have failed to load will show as red on the graph.`
+			);
+		}
 	}
 
 	/**