20:09:47 [SEVERE] Could not pass event PLAYER_INTERACT to SignHeal
java.lang.NullPointerException
        at me.secrettm.SignHeal.SignHealPlayerListener.onPlayerInteract(SignHealPlayerListener.java:25)
        at org.bukkit.plugin.java.JavaPluginLoader$9.execute(JavaPluginLoader.java:280)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:59)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:289)
        at org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:162)
        at org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:133)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:749)
        at net.minecraft.server.Packet18ArmAnimation.a(SourceFile:35)
        at net.minecraft.server.NetworkManager.a(NetworkManager.java:196)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:75)
        at net.minecraft.server.NetworkListenThread.a(SourceFile:100)
        at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:372)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:287)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:394)