diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 94c56de..1ea86e6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -90,7 +90,7 @@ jobs:
         if: steps.cache-otp.outputs.cache-hit != 'true'
         run: |
           mkdir -p ./cache/otp
-          curl -fSL https://cocoa.build/otp/v${{ env.OTP_VERSION }}/otp-x86_64-apple-darwin.tar.gz -o ./cache/otp/otp-v${{ env.OTP_VERSION }}-x86_64-apple-darwin.tar.gz
+          curl -fSL https://github.com/cocoa-xu/otp-build/releases/download/v${{ env.OTP_VERSION }}/otp-x86_64-apple-darwin.tar.gz -o ./cache/otp/otp-v${{ env.OTP_VERSION }}-x86_64-apple-darwin.tar.gz
           cd ./cache/otp
           tar -xzf otp-v${{ env.OTP_VERSION }}-x86_64-apple-darwin.tar.gz
 
diff --git a/lib/adbc_column.ex b/lib/adbc_column.ex
index 8c8198b..4780505 100644
--- a/lib/adbc_column.ex
+++ b/lib/adbc_column.ex
@@ -1198,14 +1198,16 @@ defmodule Adbc.Column do
   end
 
   defp handle_decimal(decimal_data, bits, scale) do
-    Enum.map(decimal_data, fn data ->
-      <<decimal::signed-integer-size(bits)-little>> = data
+    Enum.map(decimal_data, fn
+      <<decimal::signed-integer-size(bits)-little>> ->
+        if decimal < 0 do
+          Decimal.new(-1, -decimal, -scale)
+        else
+          Decimal.new(1, decimal, -scale)
+        end
 
-      if decimal < 0 do
-        Decimal.new(-1, -decimal, -scale)
-      else
-        Decimal.new(1, decimal, -scale)
-      end
+      nil ->
+        nil
     end)
   end
 
diff --git a/test/adbc_column_test.exs b/test/adbc_column_test.exs
index 92f55ed..d911c2e 100644
--- a/test/adbc_column_test.exs
+++ b/test/adbc_column_test.exs
@@ -41,6 +41,30 @@ defmodule Adbc.Column.Test do
       assert value == decode2 / :math.pow(10, scale)
     end
 
+    test "nil in data" do
+      bitwidth = 128
+      precision = 19
+      scale = 10
+
+      decimal_with_nil = %Adbc.Column{
+        data: [nil],
+        metadata: nil,
+        name: nil,
+        nullable: true,
+        type: {:decimal, bitwidth, precision, scale}
+      }
+
+      assert %Adbc.Column{
+               name: nil,
+               type: {:decimal, ^bitwidth, ^precision, ^scale},
+               nullable: true,
+               metadata: nil,
+               data: [nil],
+               length: nil,
+               offset: nil
+             } = Adbc.Column.materialize(decimal_with_nil)
+    end
+
     test "floats" do
       value = 12345