message '("updateMe",Height {unHeight = 0})' printed

I'm playing with Requester and the message ("updateMe", Height {unHeight = 0}) got printed. 
This message is from [this location](https://github.com/reflex-frp/reflex/blob/d77ad8cfdd1869688475e3140304e3899dc7b605/src/Reflex/Spider/Internal.hs#L2263) and seems to be for debugging purposes. What does this message mean? Is it permissible to remove the printing?