diff --git a/src/logger.gd b/src/logger.gd
index 0acdbd6..c2deee7 100644
--- a/src/logger.gd
+++ b/src/logger.gd
@@ -52,13 +52,15 @@ func _cleanup() -> void:
 func _schedule() -> void:
 	var instances_remove_enty: Array[CoreLoggerInstance] = []
 	for instance in instances:
-		instances_remove_enty.append(instance)
 		if !is_instance_valid(instance): continue
 		if !is_instance_valid(instance.parent):
 			logger.diag("Removing instance '" + instance.name + "'")
 			instance.queue_free()
+			instances_remove_enty.append(instance)
 	for instance in instances_remove_enty:
-		instances.remove_at(instances.find(instance))
+		var index: int = instances.find(instance)
+		if index == -1: logger.error("Invalid index -1")
+		else: instances.remove_at(index)
 
 func _pull_config() -> void:
 	config_level = core.config.logger_level