diff --git a/src/Nethermind/Nethermind.Evm.Test/Eip7918Tests.cs b/src/Nethermind/Nethermind.Evm.Test/Eip7918Tests.cs
index aa8ee81eeef..960badcf5fe 100644
--- a/src/Nethermind/Nethermind.Evm.Test/Eip7918Tests.cs
+++ b/src/Nethermind/Nethermind.Evm.Test/Eip7918Tests.cs
@@ -91,4 +91,25 @@ private static IEnumerable<TestCaseData> GenerateTestCases()
             (ulong)baseFeePerGas + 100,
             expectedExcessBlobGas);
     }
+
+    [Test]
+    public void Excess_blob_gas_with_null_ExcessBlobGas_applies_floor_correctly()
+    {
+        IReleaseSpec spec = Osaka.Instance;
+        int blobsUsed = (int)spec.TargetBlobCount + 1;
+
+        // null ExcessBlobGas treated as 0, floor applies
+        BlockHeader parentHeader = Build.A.BlockHeader
+            .WithBlobGasUsed(BlobGasCalculator.CalculateBlobGas(blobsUsed))
+            .WithExcessBlobGas(null)
+            .WithBaseFee(1_000_000_000)
+            .TestObject;
+
+        ulong? result = BlobGasCalculator.CalculateExcessBlobGas(parentHeader, spec);
+
+        ulong blobGasUsed = BlobGasCalculator.CalculateBlobGas(blobsUsed);
+        ulong expected = blobGasUsed * (spec.MaxBlobCount - spec.TargetBlobCount) / spec.MaxBlobCount;
+
+        Assert.That(result, Is.EqualTo(expected));
+    }
 }
diff --git a/src/Nethermind/Nethermind.Evm/BlobGasCalculator.cs b/src/Nethermind/Nethermind.Evm/BlobGasCalculator.cs
index 7dbe87e1de8..cce5cfa7ee5 100644
--- a/src/Nethermind/Nethermind.Evm/BlobGasCalculator.cs
+++ b/src/Nethermind/Nethermind.Evm/BlobGasCalculator.cs
@@ -117,7 +117,7 @@ static bool FakeExponentialOverflow(UInt256 factor, UInt256 num, UInt256 denomin
 
         if (releaseSpec.IsEip7918Enabled)
         {
-            TryCalculateFeePerBlobGas(parentBlockHeader, releaseSpec.BlobBaseFeeUpdateFraction, out UInt256 feePerBlobGas);
+            TryCalculateFeePerBlobGas(excessBlobGas, releaseSpec.BlobBaseFeeUpdateFraction, out UInt256 feePerBlobGas);
             UInt256 floorCost = Eip7918Constants.BlobBaseCost * parentBlockHeader.BaseFeePerGas;
             UInt256 targetCost = Eip4844Constants.GasPerBlob * feePerBlobGas;