Sponge RTM bug

Hello guys.

I found a bug on my modpack and could tracé it back to 1 mod which causes a block bug when used with sponge.
So what happens is when i want to destroy a block it gets invisible. When placing another one over it the old block reappears. Even if i restart the server the block stays. So the problem is i can place every block but cant remove Any. When i remove sponge and run the rtm mod on forge only there is no problem. But i would like to use plug-ins and therefore i need sponge. If someone have a possible solution for this. Or mabye point me in the right direction would be much appriciated.

An update : Here is the part of the server log. So in survival mode i cannot break blocks , but i can place blocks.

[09:23:17] [Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_111]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_111]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) [h.class:?]
at org.spongepowered.common.SpongeImplHooks.onUtilRunTask(SpongeImplHooks.java:241) [SpongeImplHooks.class:1.10.2-2281-5.2.0-BETA-2464]
at net.minecraft.server.MinecraftServer.redirect$onRun$zhp000(MinecraftServer.java:3932) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:668) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387) [ld.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471) [MinecraftServer.class:?]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_111]
Caused by: java.lang.NullPointerException
at jp.ngt.ngtlib.event.NGTEventHandler.onLeftClickBlock(NGTEventHandler.java:104) ~[NGTEventHandler.class:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_283_NGTEventHandler_onLeftClickBlock_LeftClickBlock.invoke(.dynamic) ~[?:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) ~[ASMEventHandler.class:?]
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:635) ~[EventBus.class:?]
at org.spongepowered.mod.event.SpongeForgeEventFactory.createPlayerInteractEvent(SpongeForgeEventFactory.java:806) ~[SpongeForgeEventFactory.class:1.10.2-2281-5.2.0-BETA-2464]
at org.spongepowered.mod.event.SpongeForgeEventFactory.callForgeEvent(SpongeForgeEventFactory.java:462) ~[SpongeForgeEventFactory.class:1.10.2-2281-5.2.0-BETA-2464]
at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:292) ~[SpongeModEventManager.class:1.10.2-2281-5.2.0-BETA-2464]
at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:338) ~[SpongeModEventManager.class:1.10.2-2281-5.2.0-BETA-2464]
at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:326) ~[SpongeModEventManager.class:1.10.2-2281-5.2.0-BETA-2464]
at org.spongepowered.common.SpongeImpl.postEvent(SpongeImpl.java:143) ~[SpongeImpl.class:1.10.2-2281-5.2.0-BETA-2464]
at org.spongepowered.common.event.SpongeCommonEventFactory.callInteractBlockEventPrimary(SpongeCommonEventFactory.java:526) ~[SpongeCommonEventFactory.class:1.10.2-2281-5.2.0-BETA-2464]
at org.spongepowered.common.network.PacketUtil.firePreEvents(PacketUtil.java:224) ~[PacketUtil.class:1.10.2-2281-5.2.0-BETA-2464]
at org.spongepowered.common.network.PacketUtil.onProcessPacket(PacketUtil.java:90) ~[PacketUtil.class:1.10.2-2281-5.2.0-BETA-2464]
at net.minecraft.network.PacketThreadUtil$1.redirect$onProcessPacket$zjj000(SourceFile:539) ~[fl$1.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) ~[fl$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_111]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_111]
at net.minecraft.util.Util.func_181617_a(SourceFile:45) ~[h.class:?]
… 7 more

There appears to be an issue with this mod. Are you able to consistently reproduce this on a fresh world?