Index: binaries/data/mods/public/simulation/components/GuiInterface.js
===================================================================
--- binaries/data/mods/public/simulation/components/GuiInterface.js
+++ binaries/data/mods/public/simulation/components/GuiInterface.js
@@ -591,7 +591,13 @@
 	let auraNames = template.Auras._string.split(/\s+/);
 
 	for (let name of auraNames)
-		aurasTemplate[name] = AuraTemplates.Get(name);
+	{
+		let auraTemplate = AuraTemplates.Get(name);
+		if (!auraTemplate)
+			error("Template " + templateName + " has undefined aura " + name);
+		else
+			aurasTemplate[name] = auraTemplate;
+	}
 
 	return GetTemplateDataHelper(template, owner, aurasTemplate);
 };