Unable to access shops

[DaytonaX2]

[00:47:11 ERROR]: Could not pass event PlayerInteractEvent to ClickShop v1.0.2
java.lang.NullPointerException: Cannot invoke "Object.toString()" because the return value of "java.util.Map$Entry.getValue()" is null
        at ClickShop-1.0.2 (1).jar/me.clickism.clickshop.utils.Parameterizer.toString(Parameterizer.java:52) ~[ClickShop-1.0.2 (1).jar:?]
        at ClickShop-1.0.2 (1).jar/me.clickism.clickshop.menu.buy.BuyMenu.getTitle(BuyMenu.java:39) ~[ClickShop-1.0.2 (1).jar:?]
        at ClickShop-1.0.2 (1).jar/me.clickism.clickshop.menu.buy.BuyMenu.<init>(BuyMenu.java:14) ~[ClickShop-1.0.2 (1).jar:?]
        at ClickShop-1.0.2 (1).jar/me.clickism.clickshop.events.ShopInteractEvent.onInteract(ShopInteractEvent.java:43) ~[ClickShop-1.0.2 (1).jar:?]
        at ClickShop-1.0.2 (1).jar/me.clickism.clickshop.events.InteractEvent.handleInteract(InteractEvent.java:36) ~[ClickShop-1.0.2 (1).jar:?]
        at ClickShop-1.0.2 (1).jar/me.clickism.clickshop.events.ShopInteractEvent.onPlayerInteract(ShopInteractEvent.java:20) ~[ClickShop-1.0.2 (1).jar:?]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:71) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?]
        at io.papermc.paper.plugin.manager.PaperEventManager.callEvent(PaperEventManager.java:54) ~[paper-1.21.10.jar:1.21.10-64-fba780d]
        at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent(PaperPluginManagerImpl.java:131) ~[paper-1.21.10.jar:1.21.10-64-fba780d]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:628) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:519) ~[paper-1.21.10.jar:1.21.10-64-fba780d]
        at net.minecraft.server.level.ServerPlayerGameMode.useItemOn(ServerPlayerGameMode.java:502) ~[paper-1.21.10.jar:1.21.10-64-fba780d]
        at net.minecraft.server.network.ServerGamePacketListenerImpl.handleUseItemOn(ServerGamePacketListenerImpl.java:2055) ~[paper-1.21.10.jar:1.21.10-64-fba780d]
        at net.minecraft.network.protocol.game.ServerboundUseItemOnPacket.handle(ServerboundUseItemOnPacket.java:45) ~[paper-1.21.10.jar:1.21.10-64-fba780d]
        at net.minecraft.network.protocol.game.ServerboundUseItemOnPacket.handle(ServerboundUseItemOnPacket.java:10) ~[paper-1.21.10.jar:1.21.10-64-fba780d]
        at net.minecraft.network.PacketProcessor$ListenerAndPacket.handle(PacketProcessor.java:99) ~[paper-1.21.10.jar:1.21.10-64-fba780d]
        at net.minecraft.network.PacketProcessor.executeSinglePacket(PacketProcessor.java:33) ~[paper-1.21.10.jar:1.21.10-64-fba780d]
        at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1484) ~[paper-1.21.10.jar:1.21.10-64-fba780d]
        at net.minecraft.server.MinecraftServer.recordTaskExecutionTimeWhileWaiting(MinecraftServer.java:1194) ~[paper-1.21.10.jar:1.21.10-64-fba780d]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1325) ~[paper-1.21.10.jar:1.21.10-64-fba780d]
        at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:353) ~[paper-1.21.10.jar:1.21.10-64-fba780d]
        at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]

If the shop is a normal chest it seems I can access it but if the shop is a different block it seems to break