Little problem after wp 4.9.6

After i have install wp 4.9.6 when i go to customize my tecnologino.com i see this error message. The error is visible only in admin side and only if i go to customize, any idea? I deleted cache, stopped all plugin, deleted all custom css but nothing work. screenshot: https://www.dropbox.com/s/hh8dlltn50yriso/problem.png?dl=0