Fix issue 1231

git-svn-id: http://svn.dmdirc.com/trunk@4043 00569f92-eb28-0410-84fd-f71c24880f

src/com/dmdirc/addons/dcc/DCCSend.java

 	@Override
 	protected void socketClosed() {
 		// Try to close both, even if one fails.
-		try { out.close(); } catch (IOException e) { }
-		try { in.close(); } catch (IOException e) { }
+		if (out != null) { try { out.close(); } catch (IOException e) { } }
+		if (in != null) { try { in.close(); } catch (IOException e) { } }
 		out = null;
 		in = null;
 		if (handler != null) {