diff --git a/LSLib/LS/Story/Database.cs b/LSLib/LS/Story/Database.cs
index b23ce7f0..bf96f31f 100644
--- a/LSLib/LS/Story/Database.cs
+++ b/LSLib/LS/Story/Database.cs
@@ -203,7 +203,10 @@ public void Read(OsiReader reader)
         Parameters = new ParameterList();
         Parameters.Read(reader);
 
-        FactsPosition = reader.BaseStream.Position;
+        if (reader.BaseStream.CanSeek)
+        {
+            FactsPosition = reader.BaseStream.Position;
+        }
         Facts = new FactCollection(this, reader.Story);
         reader.ReadList<Fact>(Facts);
     }