diff --git a/binaries/data/mods/public/simulation/components/TechnologyManager.js b/binaries/data/mods/public/simulation/components/TechnologyManager.js
index 1702b4ce7c..b1be6ddfad 100644
--- a/binaries/data/mods/public/simulation/components/TechnologyManager.js
+++ b/binaries/data/mods/public/simulation/components/TechnologyManager.js
@@ -90,6 +90,9 @@ TechnologyManager.prototype.Technology.prototype.Finish = function()
 	this.finished = true;
 
 	const template = TechnologyTemplates.Get(this.templateName);
+	if (!template)
+		error("Trying to finish non-existing technology: " + this.templateName + ".")
+
 	if (template.soundComplete)
 		Engine.QueryInterface(SYSTEM_ENTITY, IID_SoundManager)?.PlaySoundGroup(template.soundComplete, this.researcher);