Note: The source file, src and usr are all from the FIRST of the identical runtimes. Everything else is cropped.

Total unique runtimes: 1
Total runtimes: 2

** Runtimes **

The following runtime has occurred 2 time(s).
runtime error: Cannot execute null.react().
proc name: process atmos (/obj/machinery/portable_atmospherics/process_atmos)
  source file: code/modules/atmospherics/machinery/portable/portable_atmospherics.dm,52
  usr: null
  src: the portable air scrubber (/obj/machinery/portable_atmospherics/scrubber)
  src.loc: null