This is for the latest version, 2.5.5. When a user right-clicks while holding the Pistachio item, they are disconnected from the multiplayer server and their game crashes. This also occurs in single player.

Server crash log:
[11:06:53] [Server thread/FATAL]: Error executing task on Server java.lang.NullPointerException: null at net.minecraft.class_1792.handler$zem000$use(class_1792.java:535) ~[intermediary-server.jar:?] at net.minecraft.class_1792.method_7836(class_1792.java) ~[intermediary-server.jar:?] at net.minecraft.class_1799.method_7913(class_1799.java:239) ~[intermediary-server.jar:?] at net.minecraft.class_3225.method_14256(class_3225.java:283) ~[intermediary-server.jar:?] at net.minecraft.class_3244.method_12065(class_3244.java:1076) ~[intermediary-server.jar:?] at net.minecraft.class_2886.method_12550(class_2886.java:31) ~[intermediary-server.jar:?] at net.minecraft.class_2886.method_11054(class_2886.java:9) ~[intermediary-server.jar:?] at net.minecraft.class_2600.method_11072(class_2600.java:21) ~[intermediary-server.jar:?] at net.minecraft.class_3738.run(class_3738.java:18) ~[intermediary-server.jar:?] at net.minecraft.class_1255.method_18859(class_1255.java:144) ~[intermediary-server.jar:?] at net.minecraft.class_4093.method_18859(class_4093.java:23) ~[intermediary-server.jar:?] at net.minecraft.server.MinecraftServer.method_24306(MinecraftServer.java:761) ~[intermediary-server.jar:?] at net.minecraft.server.MinecraftServer.method_18859(MinecraftServer.java:155) ~[intermediary-server.jar:?] at net.minecraft.class_1255.method_16075(class_1255.java:118) ~[intermediary-server.jar:?] at net.minecraft.server.MinecraftServer.method_20415(MinecraftServer.java:743) ~[intermediary-server.jar:?] at net.minecraft.server.MinecraftServer.method_16075(MinecraftServer.java:737) ~[intermediary-server.jar:?] at net.minecraft.class_1255.method_18857(class_1255.java:127) ~[intermediary-server.jar:?] at net.minecraft.server.MinecraftServer.method_16208(MinecraftServer.java:722) ~[intermediary-server.jar:?] at net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:674) ~[intermediary-server.jar:?] at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:257) ~[intermediary-server.jar:?] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_275]