IndexOutOfBoundsException with no stacktrace with setter with no params

[PlanetTeamSpeakk]

I made a mixin with a couple getters and two setters, but I forgot to add parameters to those setters which caused an IndexOutOfBoundsException with no stacktrace to be thrown whenever I tried to build, launch, etc.
This was a huge pain as finding the cause of an error with no stacktrace is no easy task.
The message of the exception was Index: 0, Size: 0 so I can only assume that Mercury assumes that setters always have a parameter and doesn't actually check for it first.

The mixin that caused this error was

@Mixin(Entity.class)
public interface MixinEntityAccessor {
    @Accessor("entityId")
    int getEntityId_();

    @Accessor("yaw")
    float getYaw_();

    @Accessor("pitch")
    float getPitch_();

    @Accessor("yaw")
    void setYaw_();

    @Accessor("pitch")
    void setPitch_();
}

As you can see, the last two methods, which are setters, don't have a parameter even though they obviously should.
A more detailed error message, especially one stating where this mistake was made, would be highly appreciated.