diff --git a/OpenKh.Bbs/Ctd.cs b/OpenKh.Bbs/Ctd.cs
index 09ddeb5f7..d06cd7660 100644
--- a/OpenKh.Bbs/Ctd.cs
+++ b/OpenKh.Bbs/Ctd.cs
@@ -140,6 +140,13 @@ public void Write(Stream stream)
             }
         }
 
+        public Ctd()
+        {
+            Unknown = 0;
+            Entries1 = new List<FakeEntry>();
+            Entries2 = new List<Entry2>();
+        }
+
         private Ctd(Stream stream)
         {
             var header = BinaryMapping.ReadObject<Header>(stream);
diff --git a/OpenKh.Tests/Bbs/CtdTests.cs b/OpenKh.Tests/Bbs/CtdTests.cs
index f4d9b535f..67f597105 100644
--- a/OpenKh.Tests/Bbs/CtdTests.cs
+++ b/OpenKh.Tests/Bbs/CtdTests.cs
@@ -74,5 +74,16 @@ public void WritesBackCorrectly() => FileOpenRead(FileName, stream =>
 
                 return outStream;
             }));
+
+        [Fact]
+        public void CreateEmptyCtdWithoutNullValues()
+        {
+            var ctd = new Ctd();
+            Assert.NotNull(ctd.Entries1);
+            Assert.NotNull(ctd.Entries2);
+            Assert.Empty(ctd.Entries1);
+            Assert.Empty(ctd.Entries2);
+            Assert.Equal(0, ctd.Unknown);
+        }
     }
 }