diff --git a/source/qjs_actor.c b/source/qjs_actor.c
index ea0df91a..512e37bd 100644
--- a/source/qjs_actor.c
+++ b/source/qjs_actor.c
@@ -74,6 +74,10 @@ JSValue actor2js(JSContext *js, cell_rt *actor)
 }
 
 JSC_CCALL(os_createactor,
+  cell_rt *rt = JS_GetContextOpaque(js);
+  if (rt->disrupt)
+    return JS_ThrowInternalError(js, "Can't start a new actor while disrupting.");
+
   void *startup = value2wota(js, argv[0], JS_UNDEFINED);
   create_actor(startup);
 )
diff --git a/tests/unneeded.ce b/tests/unneeded.ce
index bad30692..c463bf9f 100644
--- a/tests/unneeded.ce
+++ b/tests/unneeded.ce
@@ -1,4 +1,4 @@
 $_.unneeded(_ => {
   log.console("Unneded function fired.");
-  $_.unneeded($_.stop, 1);
+  $_.start(undefined, "unneeded")
 }, 1);