Native creative java.lang.NullPointerException

[jani2gopal]

Hello, I amusing current version of rtb4free with bidder deployed in docker container. The. bidder is working without any issues when the creative type is banner or video.
However, when i try to bid on creative type native, it throuws null point exception as follows,

bidder_1 | java.lang.NullPointerException
bidder_1 | at com.jacamars.dsp.rtb.nativeads.creative.NativeCreative.getEscapedAdm(NativeCreative.java:186)
bidder_1 | at com.jacamars.dsp.rtb.common.Creative.getUnencodedNativeAdm(Creative.java:1334)
bidder_1 | at com.jacamars.dsp.rtb.pojo.BidResponse.makeResponse(BidResponse.java:742)
bidder_1 | at com.jacamars.dsp.rtb.pojo.BidResponse.(BidResponse.java:150)
bidder_1 | at com.jacamars.dsp.rtb.pojo.BidRequest.buildNewBidResponse(BidRequest.java:381)
bidder_1 | at com.jacamars.dsp.rtb.bidder.CampaignSelector.getMaxConnections(CampaignSelector.java:201)
bidder_1 | at com.jacamars.dsp.rtb.bidder.Handler.handle(RTBServer.java:1289)
bidder_1 | at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
bidder_1 | at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235)
bidder_1 | at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624)
bidder_1 | at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1598)
bidder_1 | at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
bidder_1 | at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
bidder_1 | at org.eclipse.jetty.server.Server.handle(Server.java:516)
bidder_1 | at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:388)
bidder_1 | at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:633)
bidder_1 | at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:380)
bidder_1 | at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277)
bidder_1 | at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
bidder_1 | at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)
bidder_1 | at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104)
bidder_1 | at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336)
bidder_1 | at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313)
bidder_1 | at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171)
bidder_1 | at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129)
bidder_1 | at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:383)
bidder_1 | at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:882)
bidder_1 | at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1036)
bidder_1 | at java.base/java.lang.Thread.run(Thread.java:834)

I tried everything in my knowledge to get it work, but somehow can not get it work.

Below is the request I am sending, (note, I removed domain and buyerid for privacy concerns)

{
"id": "f07a75e6-dd53-45ac-98fb-3b390da1ef8a-h0k8",
"test": 1,
"tmax": 580,
"at": 2,
"cur": [
"USD"
],
"imp": [
{
"id": "1",
"instl": 0,
"secure": 1,
"bidfloor": 0.0000000034605263157894736,
"bidfloorcur": "USD",
"native":{"request":"{"native":{"ver":"1.2","assets":[{"id":1,"required":0,"title":{"len":100}},{"id":3,"required":0,"data":{"type":1,"len":30}},{"id":2,"required":0,"data":{"type":2,"len":100}},{"id":4,"required":0,"img":{"type":3,"w":150,"h":100,"wratio":150,"hratio":100,"wmin":150}}]}}"}
}
],
"site": {
"id": "15",
"domain": "----------",
"page": "------------",
"publisher": {
"id": "15",
"domain": "-------------------"
}
},
"device": {
"ua": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36 Edge/18.18363",
"geo": {
"country": "IND"
},
"ip": "172.24.30.130",
"os": "Windows 10",
"osv": "NT 10.0",
"model": "Edge - Windows"
},
"user": {
"id": "58f6550a-7623-4ca2-9ccb-7c00c8f937df-1sk24",
"buyeruid": "--------------------"
}
}