Any ideas what the following exception is about?

MongoDB Atlas App Services & Realm
,
1 
FATAL EXCEPTION: DefaultDispatcher-worker-2
                                                                                                   
java.lang.NullPointerException
                                                                                                    	at io.realm.kotlin.internal.SuspendableWriter.freezeWriteReturnValue(SuspendableWriter.kt:167)
                                                                                                    	at io.realm.kotlin.internal.SuspendableWriter.access$freezeWriteReturnValue(SuspendableWriter.kt:49)
                                                                                                    	at io.realm.kotlin.internal.SuspendableWriter$write$2.invokeSuspend(SuspendableWriter.kt:148)
                                                                                                    	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
                                                                                                    	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:104)
                                                                                                    	at java.util.concurrent.ThreadPoolExecutor.processTask(ThreadPoolExecutor.java:1187)
                                                                                                    	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1152)
                                                                                                    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
                                                                                                    	at java.lang.Thread.run(Thread.java:784)
                                                                                                    	Suppressed: kotlinx.coroutines.internal.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@8d41729, Dispatchers.IO]