diff --git a/src/bot/api.ts b/src/bot/api.ts
index d79a44564d5..0fe0ab44631 100644
--- a/src/bot/api.ts
+++ b/src/bot/api.ts
@@ -1009,7 +1009,11 @@ class API extends Core {
             justStarted = true;
 
             for (const event of getFunctionList('streamStart')) {
-              this[event.fName]();
+              if (typeof this[event.fName] === 'function') {
+                this[event.fName]();
+              } else {
+                throw new Error(`!!! Event ${event.path} don't have function ${event.fName} !!!`);
+              }
             }
           }
         }