diff --git a/Socialmetrica.package/TweetsCollection.class/instance/oldest.st b/Socialmetrica.package/TweetsCollection.class/instance/oldest.st
index 430aa4b..058b73f 100644
--- a/Socialmetrica.package/TweetsCollection.class/instance/oldest.st
+++ b/Socialmetrica.package/TweetsCollection.class/instance/oldest.st
@@ -1,3 +1,5 @@
 accessing
 oldest
+	self messages ifNil: [ ^ nil ].
+	self messages ifEmpty: [ ^ nil ].
 	^ self last
\ No newline at end of file