On a fresh install, "Special dev fix, report is abnormal"

[Former user]

When doing a fresh install of City on my server, I keep getting the error "Special dev fix, report is abnormal" getting spammed to all of my players, with no real explanation to what could possibly be going on. Can you help?

[Bruno]

Just a debug message, remove with fix:

https://bitbucket.org/quequiere/city/commits/bc06c12427cf219f0d4bc464b4407b715666cd24