diff --git a/src/java/net/jpountz/lz4/LZ4BlockOutputStream.java b/src/java/net/jpountz/lz4/LZ4BlockOutputStream.java
index ffdebb99..f32c0ef6 100644
--- a/src/java/net/jpountz/lz4/LZ4BlockOutputStream.java
+++ b/src/java/net/jpountz/lz4/LZ4BlockOutputStream.java
@@ -171,9 +171,13 @@ public void write(byte[] b) throws IOException {
 
   @Override
   public void close() throws IOException {
-    ensureNotFinished();
-    finish();
-    out.close();
+    if (!finished) {
+      finish();
+    }
+    if (out != null) {
+      out.close();
+      out = null;
+    }
   }
 
   private void flushBufferedData() throws IOException {
diff --git a/src/test/net/jpountz/lz4/LZ4BlockStreamingTest.java b/src/test/net/jpountz/lz4/LZ4BlockStreamingTest.java
index 695e5714..2d47be33 100644
--- a/src/test/net/jpountz/lz4/LZ4BlockStreamingTest.java
+++ b/src/test/net/jpountz/lz4/LZ4BlockStreamingTest.java
@@ -21,6 +21,7 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.nio.charset.Charset;
 import java.util.Arrays;
 import java.util.zip.Adler32;
 import java.util.zip.CRC32;
@@ -271,4 +272,25 @@ public void testRoundtripEmpty() throws IOException {
     testRoundTrip(new byte[0]);
   }
 
+  @Test
+  public void testDoubleClose() throws IOException {
+    final byte[] testBytes = "Testing!".getBytes(Charset.forName("UTF-8"));
+
+    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
+    LZ4BlockOutputStream out = new LZ4BlockOutputStream(bytes);
+
+    out.write(testBytes);
+
+    out.close();
+    out.close();
+
+    LZ4BlockInputStream in = new LZ4BlockInputStream(new ByteArrayInputStream(bytes.toByteArray()));
+    byte[] actual = new byte[testBytes.length];
+    in.read(actual);
+
+    assertArrayEquals(testBytes, actual);
+
+    in.close();
+    in.close();
+  }
 }