Sticky ANR [libart.so] art::ConditionVariable::WaitHoldingLocks

No matter what I do, I can't get rid of this ANR. Before closing the application, I set all clocks and the Webviewer to (gotoURL:"about:blank"). I stop all dynamic blocks and then close application, but I still get a very high ANR, around 4%.
I suspect Open Street Maps. But I don't know what to do. There is no way to stop it.
Does anyone have any ideas?

"downloader" tid=49 Native
#00 pc 0x00000000000e7ef4 /apex/com.android.runtime/lib64/bionic/libc.so (recvfrom+4)
#01 pc 0x000000000002c4f8 /apex/com.android.art/lib64/libopenjdk.so (NET_Read+80)
#02 pc 0x000000000002d074 /apex/com.android.art/lib64/libopenjdk.so (SocketInputStream_socketRead0+216)
at java.net.SocketInputStream.socketRead0 (Native method)
at java.net.SocketInputStream.socketRead (SocketInputStream.java:118)
at java.net.SocketInputStream.read (SocketInputStream.java:173)
at java.net.SocketInputStream.read (SocketInputStream.java:143)
at com.android.org.conscrypt.ConscryptEngineSocket$SSLInputStream.readFromSocket (ConscryptEngineSocket.java:994)
at com.android.org.conscrypt.ConscryptEngineSocket$SSLInputStream.processDataFromSocket (ConscryptEngineSocket.java:958)
at com.android.org.conscrypt.ConscryptEngineSocket$SSLInputStream.readUntilDataAvailable (ConscryptEngineSocket.java:873)
at com.android.org.conscrypt.ConscryptEngineSocket$SSLInputStream.read (ConscryptEngineSocket.java:846)
at com.android.okhttp.okio.Okio$2.read (Okio.java:138)
at com.android.okhttp.okio.AsyncTimeout$2.read (AsyncTimeout.java:213)
at com.android.okhttp.okio.RealBufferedSource.indexOf (RealBufferedSource.java:307)
at com.android.okhttp.okio.RealBufferedSource.indexOf (RealBufferedSource.java:301)
at com.android.okhttp.okio.RealBufferedSource.readUtf8LineStrict (RealBufferedSource.java:197)
at com.android.okhttp.internal.http.Http1xStream.readResponse (Http1xStream.java:188)
at com.android.okhttp.internal.http.Http1xStream.readResponseHeaders (Http1xStream.java:129)
at com.android.okhttp.internal.http.HttpEngine.readNetworkResponse (HttpEngine.java:750)
at com.android.okhttp.internal.http.HttpEngine.readResponse (HttpEngine.java:622)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute (HttpURLConnectionImpl.java:475)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse (HttpURLConnectionImpl.java:411)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponseCode (HttpURLConnectionImpl.java:542)
at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.getResponseCode (DelegatingHttpsURLConnection.java:106)
at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.getResponseCode (HttpsURLConnectionImpl.java:30)
at org.osmdroid.tileprovider.modules.MapTileDownloader$TileLoader.loadTile (MapTileDownloader.java:206)
at org.osmdroid.tileprovider.modules.MapTileModuleProviderBase$TileLoader.run (MapTileModuleProviderBase.java:317)
at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1154)
at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:652)
at java.lang.Thread.run (Thread.java:1563)