diff --git a/WinUSBNet/USBDevice.cs b/WinUSBNet/USBDevice.cs
index 8255182..438b39e 100644
--- a/WinUSBNet/USBDevice.cs
+++ b/WinUSBNet/USBDevice.cs
@@ -254,14 +254,12 @@ public IAsyncResult BeginControlTransfer(byte requestType, byte request, int val
             }
             catch (API.APIException e)
             {
-                if (result != null)
-                    result.Dispose();
-                 throw new USBException("Asynchronous control transfer failed", e);
+                result.Dispose();
+                throw new USBException("Asynchronous control transfer failed", e);
             }
             catch (Exception)
             {
-                if (result != null)
-                    result.Dispose();
+                result.Dispose();
                 throw;
             }
             return result;
diff --git a/WinUSBNet/USBPipe.cs b/WinUSBNet/USBPipe.cs
index 1506021..98c9758 100644
--- a/WinUSBNet/USBPipe.cs
+++ b/WinUSBNet/USBPipe.cs
@@ -179,14 +179,12 @@ public IAsyncResult BeginRead(byte[] buffer, int offset, int length, AsyncCallba
             }
             catch (API.APIException e)
             {
-                if (result != null)
-                    result.Dispose();
+                result.Dispose();
                 throw new USBException("Failed to read from pipe.", e);
             }
             catch (Exception)
             {
-                if (result != null)
-                    result.Dispose();
+                result.Dispose();
                 throw;
             }
             return result;
@@ -282,14 +280,12 @@ public IAsyncResult BeginWrite(byte[] buffer, int offset, int length, AsyncCallb
             }
             catch (API.APIException e)
             {
-                if (result != null)
-                    result.Dispose();
+                result.Dispose();
                 throw new USBException("Failed to write to pipe.", e);
             }
             catch (Exception)
             {
-                if (result != null)
-                    result.Dispose();
+                result.Dispose();
                 throw;
             }
             return result;