diff --git a/osu.Game/Localisation/ResourceManagerLocalisationStore.cs b/osu.Game/Localisation/ResourceManagerLocalisationStore.cs
index a35ce7a9c8..6a4e38fb38 100644
--- a/osu.Game/Localisation/ResourceManagerLocalisationStore.cs
+++ b/osu.Game/Localisation/ResourceManagerLocalisationStore.cs
@@ -29,6 +29,9 @@ namespace osu.Game.Localisation
         {
             var split = lookup.Split(':');
 
+            if (split.Length < 2)
+                return null;
+
             string ns = split[0];
             string key = split[1];