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2 files changed, 9 insertions, 4 deletions

diff --git a/src/org/traccar/http/AsyncServlet.java b/src/org/traccar/http/AsyncServlet.java
index aeab5855b..f00257f80 100644
--- a/src/org/traccar/http/AsyncServlet.java
+++ b/src/org/traccar/http/AsyncServlet.java
@@ -34,7 +34,6 @@ import org.traccar.Context;
 import org.traccar.GlobalTimer;
 import org.traccar.database.DataCache;
 import org.traccar.helper.Log;
-import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class AsyncServlet extends HttpServlet {
@@ -51,7 +50,7 @@ public class AsyncServlet extends HttpServlet {
         private static final boolean DEBUG_ASYNC = true;
         
         private static final long SESSION_TIMEOUT = 30;
-        private static final long REQUEST_TIMEOUT = 30;
+        private static final long REQUEST_TIMEOUT = 10;
         
         private boolean destroyed;
         private final long userId;
diff --git a/src/org/traccar/http/JsonConverter.java b/src/org/traccar/http/JsonConverter.java
index 48fd934b7..0802fb9ea 100644
--- a/src/org/traccar/http/JsonConverter.java
+++ b/src/org/traccar/http/JsonConverter.java
@@ -93,9 +93,15 @@ public class JsonConverter {
                     } else if (method.getReturnType().equals(double.class)) {
                         json.add(name, (Double) method.invoke(object));
                     } else if (method.getReturnType().equals(String.class)) {
-                        json.add(name, (String) method.invoke(object));
+                        String value = (String) method.invoke(object);
+                        if (value != null) {
+                            json.add(name, value);
+                        }
                     } else if (method.getReturnType().equals(Date.class)) {
-                        json.add(name, dateFormat.format((Date) method.invoke(object)));
+                        Date value = (Date) method.invoke(object);
+                        if (value != null) {
+                            json.add(name, dateFormat.format(value));
+                        }
                     }
                 } catch (IllegalAccessException error) {
                 } catch (InvocationTargetException error) {