NullPointerException at okio.OutputStreamSink.write

[Borutsky]

Getting a lot of crash reports from production app with the following stacktraces:

Variant 1

Fatal Exception: java.lang.NullPointerException:
       at okio.OutputStreamSink.write(OutputStreamSink.java:55)
       at okio.AsyncTimeout$sink$1.write(AsyncTimeout.kt:102)
       at okio.RealBufferedSink.flush(RealBufferedSink.kt:267)
       at okhttp3.internal.http1.Http1ExchangeCodec.finishRequest(Http1ExchangeCodec.kt:155)
       at okhttp3.internal.connection.Exchange.finishRequest(Exchange.java:95)
       at okhttp3.internal.http.CallServerInterceptor.intercept(CallServerInterceptor.kt:79)
       at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:109)
       at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.kt:34)
       at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:109)
       at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.kt:95)
       at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:109)
       at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.kt:83)
       at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:109)
       at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.kt:76)
       at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:109)
       at io.sentry.android.okhttp.SentryOkHttpInterceptor.intercept(SentryOkHttpInterceptor.kt:101)
       at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:109)
       at okhttp3.logging.HttpLoggingInterceptor.intercept(HttpLoggingInterceptor.kt:154)
       at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:109)
       at okhttp3.internal.connection.RealCall.getResponseWithInterceptorChain$okhttp(RealCall.kt:201)
       at okhttp3.internal.connection.RealCall$AsyncCall.run(RealCall.kt:517)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1137)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
       at java.lang.Thread.run(Thread.java:1012)

Variant 2

Fatal Exception: java.lang.NullPointerException:
       at okio.OutputStreamSink.write(OutputStreamSink.java:55)
       at okio.AsyncTimeout$sink$1.write(AsyncTimeout.kt:102)
       at okio.RealBufferedSink.emit(RealBufferedSink.kt:261)
       at okhttp3.internal.ws.WebSocketWriter.writeMessageFrame(WebSocketWriter.kt:195)
       at okhttp3.internal.ws.RealWebSocket.writeOneFrame$okhttp(RealWebSocket.kt:527)
       at okhttp3.internal.ws.RealWebSocket$WriterTask.runOnce(RealWebSocket.kt:620)
       at okhttp3.internal.concurrent.TaskRunner.runTask(TaskRunner.kt:116)
       at okhttp3.internal.concurrent.TaskRunner.access$runTask(TaskRunner.kt:42)
       at okhttp3.internal.concurrent.TaskRunner$runnable$1.run(TaskRunner.kt:65)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1137)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
       at java.lang.Thread.run(Thread.java:1012)

We're using multiple instances of OkHttpClient for different cases. Some of them passed to Retrofit to make REST API calls. Another is used for web sockets.

I'm happy to provide any additional information if needed