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-rw-r--r--featureClass/featureManager.js2
1 files changed, 2 insertions, 0 deletions
diff --git a/featureClass/featureManager.js b/featureClass/featureManager.js
index abfdd0d..e27208f 100644
--- a/featureClass/featureManager.js
+++ b/featureClass/featureManager.js
@@ -409,6 +409,8 @@ class FeatureManager {
registerCustom(type, func, context) {
let id = this.lastChatEventId++
+ if (!func) throw new Error("Function must not be null")
+
this.customEvents[id] = {
func: func,
context: context,