@souenzzo it looks like something's wrong with your code, not a known issue, but I definitely can't say for sure.

my codebase has nothing complex, just a simple om-next project from tutorial and some attempts to make routing on this.

@souenzzo nice bug! This seems to happen whenever you print a record that implements IDeref? In Om Next's case that's both the Indexer and the Reconciler. One solution is not printing it... another is outlined here: https://gist.github.com/rwilson/34c88a97c6260a7dc703