diff --git a/.gitignore b/.gitignore
index bb9f8b6..7c1f481 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@ build/
 .vscode/
 docs/_build/
 examples/test_112.py
+venv
diff --git a/anvil/chunk.py b/anvil/chunk.py
index 976468a..09bcd86 100644
--- a/anvil/chunk.py
+++ b/anvil/chunk.py
@@ -4,7 +4,7 @@
 from .block import Block, OldBlock
 from .region import Region
 from .errors import OutOfBoundsCoordinates, ChunkNotFound
-from .versions import VERSION_21w43a, VERSION_20w17a, VERSION_19w36a, VERSION_17w47a
+from .versions import VERSION_21w43a, VERSION_20w17a, VERSION_19w36a, VERSION_17w47a, VERSION_PRE_15w32a
 
 
 def bin_append(a, b, length=None):
@@ -48,7 +48,7 @@ def _states_from_section(section: nbt.TAG_Compound) -> list:
 
 
 def _section_height_range(version: Optional[int]) -> range:
-    if version is not None and version > VERSION_17w47a:
+    if version > VERSION_17w47a:
         return range(-4, 20)
     else:
         return range(16)
@@ -82,7 +82,7 @@ def __init__(self, nbt_data: nbt.NBTFile):
         except KeyError:
             # Version is pre-1.9 snapshot 15w32a, so world does not have a Data Version.
             # See https://minecraft.wiki/w/Data_version
-            self.version = None
+            self.version = VERSION_PRE_15w32a
 
         if self.version >= VERSION_21w43a:
             self.data = nbt_data
@@ -216,7 +216,7 @@ def get_biome(self, x: int, y: int, z: int) -> Biome:
                 # Each biome index refers to a column stored Z then X.
                 index = z * 16 + x
             else:
-                # https://minecraft.fandom.com/wiki/Java_Edition_19w36a
+                # https://minecraft.wiki/w/Java_Edition_19w36a
                 # Get index on the biome list with the order YZX
                 # Each biome index refers to a 4x4 areas here so we do integer division by 4
                 index = (y // 4) * 4 * 4 + (z // 4) * 4 + (x // 4)
@@ -266,7 +266,7 @@ def get_block(
             # global Y to section Y
             y %= 16
 
-        if self.version is None or self.version < VERSION_17w47a:
+        if self.version < VERSION_17w47a:
             # Explained in depth here https://minecraft.wiki/w/index.php?title=Chunk_format&oldid=1153403#Block_format
 
             if section is None or "Blocks" not in section:
@@ -306,7 +306,7 @@ def get_block(
         # Get index on the block list with the order YZX
         index = y * 16 * 16 + z * 16 + x
         # in 20w17a and newer blocks cannot occupy more than one element on the BlockStates array
-        stretches = self.version is None or self.version < VERSION_20w17a
+        stretches = self.version < VERSION_20w17a
 
         # get location in the BlockStates array via the index
         if stretches:
diff --git a/anvil/versions.py b/anvil/versions.py
index de771b9..aca1b52 100644
--- a/anvil/versions.py
+++ b/anvil/versions.py
@@ -13,3 +13,8 @@
 # This is the version where "The Flattening" (https://minecraft.wiki/w/Java_Edition_1.13/Flattening) happened
 # where blocks went from numeric ids to namespaced ids (namespace:block_id)
 VERSION_17w47a = 1451
+
+# This represents Versions before 1.9 snapshot 15w32a, 
+# these snapshots do not have a Data Version so we use -1 since -1 is less than any valid data version.
+# https://minecraft.wiki/w/Data_version
+VERSION_PRE_15w32a = -1