Fix NPE in entity data subscription

@@ -302,7 +302,9 @@ public class DefaultTbEntityDataSubscriptionService implements TbEntityDataSubsc
         Map<Integer, TbAbstractDataSubCtx> sessionSubs = subscriptionsBySessionId.computeIfAbsent(sessionRef.getSessionId(), k -> new HashMap<>());
         TbEntityDataSubCtx ctx = new TbEntityDataSubCtx(serviceId, wsService, entityService, localSubscriptionService,
                 attributesService, stats, sessionRef, cmd.getCmdId(), maxEntitiesPerDataSubscription);
-        ctx.setAndResolveQuery(cmd.getQuery());
+        if (cmd.getQuery() != null) {
+            ctx.setAndResolveQuery(cmd.getQuery());
+        }
         sessionSubs.put(cmd.getCmdId(), ctx);
         return ctx;
     }

@@ -107,7 +107,7 @@ public abstract class TbAbstractDataSubCtx<T extends AbstractDataQuery<? extends
     public void setAndResolveQuery(T query) {
         dynamicValues.clear();
         this.query = query;
-        if (query.getKeyFilters() != null) {
+        if (query != null && query.getKeyFilters() != null) {
             for (KeyFilter filter : query.getKeyFilters()) {
                 registerDynamicValues(filter.getPredicate());
             }