diff --git a/course/lesson-15-modulo/visuals/TrafficLightsCondition.gd b/course/lesson-15-modulo/visuals/TrafficLightsCondition.gd
index 5df5b803..6665ec5d 100644
--- a/course/lesson-15-modulo/visuals/TrafficLightsCondition.gd
+++ b/course/lesson-15-modulo/visuals/TrafficLightsCondition.gd
@@ -39,6 +39,7 @@ func run() -> void:
 
 
 func reset() -> void:
+	light_index = 0
 	turn_on_light(light_index, true)
 	_index_label.text = str(light_index)
 
diff --git a/course/lesson-15-modulo/visuals/TrafficLightsModulo.gd b/course/lesson-15-modulo/visuals/TrafficLightsModulo.gd
index 093c6663..658bf1a2 100644
--- a/course/lesson-15-modulo/visuals/TrafficLightsModulo.gd
+++ b/course/lesson-15-modulo/visuals/TrafficLightsModulo.gd
@@ -36,6 +36,7 @@ func run() -> void:
 
 
 func reset() -> void:
+	light_index = 0
 	turn_on_light(light_index, true)
 	_index_label.text = str(light_index)
 
diff --git a/ui/components/RunnableCodeExample.gd b/ui/components/RunnableCodeExample.gd
index e9758c9e..8895fc3a 100644
--- a/ui/components/RunnableCodeExample.gd
+++ b/ui/components/RunnableCodeExample.gd
@@ -123,7 +123,7 @@ func step() -> void:
 			_scene_instance.has_method("run"), "Node %s does not have a run method" % [get_path()]
 		)
 
-		if _scene_instance.has_method("reset"):
+		if _scene_instance.has_method("reset") and _debugger:
 			_scene_instance.reset()
 
 		# warning-ignore:unsafe_method_access