From b2a95573bd75e8fac4f44c7bfebf353df89976f3 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Sun, 1 Jul 2018 11:14:03 -0700
Subject: Fix filter handling (fix #3958)

---
 src/org/traccar/BaseDataHandler.java | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'src/org/traccar/BaseDataHandler.java')

diff --git a/src/org/traccar/BaseDataHandler.java b/src/org/traccar/BaseDataHandler.java
index 8a461cc19..48794b0d7 100644
--- a/src/org/traccar/BaseDataHandler.java
+++ b/src/org/traccar/BaseDataHandler.java
@@ -24,7 +24,10 @@ public abstract class BaseDataHandler extends ChannelInboundHandlerAdapter {
     @Override
     public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
         if (msg instanceof Position) {
-            ctx.fireChannelRead(handlePosition((Position) msg));
+            Position position = handlePosition((Position) msg);
+            if (position != null) {
+                ctx.fireChannelRead(position);
+            }
         } else {
             super.channelRead(ctx, msg);
         }
-- 
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