Same issue. Tried re-installation of FAF (cleared cache) and SupCom FA. No change. This is preventing me from playing games, and also struggle with watching replays.

Repeatable error message when trying to view ladder maplist:

java.util.concurrent.CompletionException: java.lang.NullPointerException: Cannot invoke "com.faforever.client.domain.MapBean.getDisplayName()" because the return value of "com.faforever.client.domain.MapVersionBean.getMap()" is null
at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:331)
at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:346)
at java.base/java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:704)
at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:506)
at java.base/java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:2152)
at reactor.core.publisher.MonoToCompletableFuture.onError(MonoToCompletableFuture.java:76)
at reactor.core.publisher.MonoZip$ZipInner.onError(MonoZip.java:350)
at reactor.core.publisher.MonoCollectList$MonoCollectListSubscriber.onError(MonoCollectList.java:113)
at reactor.core.publisher.FluxTakeLast$TakeLastManySubscriber.onError(FluxTakeLast.java:189)
at reactor.core.publisher.FluxFlattenIterable$FlattenIterableSubscriber.drainAsync(FluxFlattenIterable.java:334)
at reactor.core.publisher.FluxFlattenIterable$FlattenIterableSubscriber.drain(FluxFlattenIterable.java:686)
at reactor.core.publisher.FluxFlattenIterable$FlattenIterableSubscriber.onNext(FluxFlattenIterable.java:250)
at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onNext(FluxPeekFuseable.java:185)
at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1766)
at reactor.core.publisher.MonoCollectList$MonoCollectListSubscriber.onComplete(MonoCollectList.java:128)
at reactor.core.publisher.FluxDistinct$DistinctSubscriber.onComplete(FluxDistinct.java:191)
at reactor.core.publisher.FluxFlatMap$FlatMapMain.checkTerminated(FluxFlatMap.java:845)
at reactor.core.publisher.FluxFlatMap$FlatMapMain.drainLoop(FluxFlatMap.java:607)
at reactor.core.publisher.FluxFlatMap$FlatMapMain.drain(FluxFlatMap.java:587)
at reactor.core.publisher.FluxFlatMap$FlatMapMain.onComplete(FluxFlatMap.java:464)
at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onComplete(FluxPeekFuseable.java:277)
at reactor.core.publisher.FluxReplay$UnboundedReplayBuffer.replayNormal(FluxReplay.java:554)
at reactor.core.publisher.FluxReplay$UnboundedReplayBuffer.replay(FluxReplay.java:657)
at reactor.core.publisher.FluxReplay$ReplaySubscriber.onComplete(FluxReplay.java:1273)
at reactor.core.publisher.MonoFlatMapMany$FlatMapManyInner.onComplete(MonoFlatMapMany.java:260)
at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onComplete(Operators.java:2018)
at reactor.core.publisher.FluxConcatArray$ConcatArraySubscriber.onComplete(FluxConcatArray.java:192)
at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onComplete(FluxOnAssembly.java:397)
at reactor.core.publisher.MonoFlatMapMany$FlatMapManyInner.onComplete(MonoFlatMapMany.java:260)
at reactor.core.publisher.FluxIterable$IterableSubscription.slowPath(FluxIterable.java:292)
at reactor.core.publisher.FluxIterable$IterableSubscription.request(FluxIterable.java:228)
at reactor.core.publisher.MonoFlatMapMany$FlatMapManyMain.onSubscribeInner(MonoFlatMapMany.java:150)
at reactor.core.publisher.MonoFlatMapMany$FlatMapManyInner.onSubscribe(MonoFlatMapMany.java:245)
at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:164)
at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:86)
at reactor.core.publisher.Flux.subscribe(Flux.java:8095)
at reactor.core.publisher.MonoFlatMapMany$FlatMapManyMain.onNext(MonoFlatMapMany.java:195)
at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1784)
at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:151)
at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1784)
at reactor.core.publisher.MonoReduce$ReduceSubscriber.onComplete(MonoReduce.java:139)
at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:142)
at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:142)
at reactor.core.publisher.FluxPeek$PeekSubscriber.onComplete(FluxPeek.java:259)
at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:142)
at reactor.netty.channel.FluxReceive.onInboundComplete(FluxReceive.java:383)
at reactor.netty.channel.ChannelOperations.onInboundComplete(ChannelOperations.java:396)
at reactor.netty.channel.ChannelOperations.terminate(ChannelOperations.java:452)
at reactor.netty.http.client.HttpClientOperations.onInboundNext(HttpClientOperations.java:664)
at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:94)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436)
at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:296)
at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1533)
at io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1282)
at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1329)
at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:501)
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:440)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.lang.NullPointerException: Cannot invoke "com.faforever.client.domain.MapBean.getDisplayName()" because the return value of "com.faforever.client.domain.MapVersionBean.getMap()" is null
at com.faforever.client.map.MapService.lambda$getMatchmakerMapsWithPageCount$28(MapService.java:626)
at java.base/java.util.Comparator.lambda$comparing$ea9a8b3a$1(Comparator.java:436)
at java.base/java.util.Comparator.lambda$thenComparing$36697e65$1(Comparator.java:217)
at java.base/java.util.TimSort.binarySort(TimSort.java:296)
at java.base/java.util.TimSort.sort(TimSort.java:221)
at java.base/java.util.Arrays.sort(Arrays.java:1306)
at java.base/java.util.ArrayList.sort(ArrayList.java:1721)
at reactor.core.publisher.Flux.lambda$collectSortedList$17(Flux.java:3574)
at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.poll(FluxPeekFuseable.java:332)
at reactor.core.publisher.FluxFlattenIterable$FlattenIterableSubscriber.drainAsync(FluxFlattenIterable.java:330)
... 76 more

Attached Client.log. client.log