diff --git a/acs.coffee b/acs.coffee
index c6fd6f0..a48ebcd 100644
--- a/acs.coffee
+++ b/acs.coffee
@@ -309,6 +309,11 @@ listener = (httpRequest, httpResponse) ->
       )
     else if cwmpRequest.fault?
       taskId = cwmpRequest.id
+      if not taskId
+        # Fault not related to a task. return empty response.
+        res = tr069.response(null, {}, {})
+        writeResponse(currentRequest, res)
+        return
 
       db.getTask(taskId, (task) ->
         if not task
diff --git a/config.coffee b/config.coffee
index 8106cb2..70b326d 100644
--- a/config.coffee
+++ b/config.coffee
@@ -14,7 +14,7 @@ exports.PRESETS_CACHE_DURATION = 86400
 exports.PRESETS_TIME_PADDING = 1
 exports.MONGODB_SOCKET = '/tmp/mongodb-27017.sock'
 exports.MEMCACHED_SOCKET = '/tmp/memcached.sock'
-exports.WORKER_RESPAWN_TIME = 3000
+exports.WORKER_RESPAWN_TIME = 60000
 exports.LOG_INFORMS = false
 exports.DEBUG_DEVICES = {} # {'202BC1-BM632w-8KA8WA1151100043' : true}
 exports.DEVICE_ONLINE_THRESHOLD = 4000
diff --git a/tr-069.coffee b/tr-069.coffee
index ed7f460..3de6ac3 100644
--- a/tr-069.coffee
+++ b/tr-069.coffee
@@ -211,7 +211,10 @@ exports.request = (httpRequest) ->
       # some devices send invalid utf8 characters
       xml = libxmljs.parseXml httpRequest.getBody('binary')
 
-    cwmpRequest.id = xml.get('//soap-env:Envelope/soap-env:Header/cwmp:ID', NAMESPACES).text()
+    try
+      cwmpRequest.id = xml.get('//soap-env:Envelope/soap-env:Header/cwmp:ID', NAMESPACES).text()
+    catch err
+      cwmpRequest.id = null
 
     methodElement = xml.get('/soap-env:Envelope/soap-env:Body/cwmp:*', NAMESPACES)
     if methodElement?