fix #32 potential NPE in stop method

hoegertn · hoegertn · commit 727d055f39cd · 2017-07-31T22:10:48.000+02:00
diff --git a/src/main/java/de/taimos/gpsd4java/backend/GPSdEndpoint.java b/src/main/java/de/taimos/gpsd4java/backend/GPSdEndpoint.java
@@ -148,7 +148,9 @@ public void start() {
 	public void stop() {
 		
 		try {
-			this.socket.close();
+			if (this.socket != null) {
+				this.socket.close();
+			}
 		} catch (final IOException e1) {
 			GPSdEndpoint.LOG.debug("Close forced: " + e1.getMessage());
 		}
