diff --git a/src/singletons/scene_reference.gd b/src/singletons/scene_reference.gd
index e56e369..9bd8ae7 100644
--- a/src/singletons/scene_reference.gd
+++ b/src/singletons/scene_reference.gd
@@ -26,7 +26,9 @@ func _ready() -> void:
 		sequence_actors.append([null, null])
 
 func sign_up_for_sequence(callable: Callable, sequence_id: id, index: int):
-	# if this assertion fails, two objects tried to sign up for the same sequence or an empty slot has been missing.
+	if sequence_actors[sequence_id].size() <= index:
+		sequence_actors[sequence_id].resize(index+1)
+	# if this assertion fails, two objects tried to sign up for the same sequence.
 	assert(sequence_actors[sequence_id][index] == null)
 	sequence_actors[sequence_id][index] = callable