Removed error when the mod cannot subtract the item that is being delivered. The error was spamming the log files and filling them up. Just the logging for error is disabled. Will remove the mod when the original author fixes it.
Error is here: https://mods.factorio.com/mod/logistic-signals/discussion/62c232978e48566553a73890
Mod is here: https://mods.factorio.com/mod/logistic-signals