Just a reference:
Right clicking minecarts of Steve's Cart using battle gear's battle mode will crash the game.
A detailed walkthrough of the error, its code path and all known details is as follows:
Some of the evidence important to that below
Full report:
http://pastebin.com/UE4DN3g9
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-- Head --
Stacktrace:
at vswe.stevescarts.Carts.MinecartModular.doLoadModules(MinecartModular.java:388)
at vswe.stevescarts.Carts.MinecartModular.loadModules(MinecartModular.java:377)
at vswe.stevescarts.Carts.MinecartModular.loadModules(MinecartModular.java:354)
at vswe.stevescarts.Carts.MinecartModular.func_70020_e(MinecartModular.java:1399)
at net.minecraft.entity.Entity.func_82141_a(Entity.java:2030)
at mods.battlegear2.BattlemodeHookContainerClass.hasEntityInteraction(BattlemodeHookContainerClass.java:305)
at mods.battlegear2.BattlemodeHookContainerClass.onOffhandAttack(BattlemodeHookContainerClass.java:284)