So I upgraded from 2019.2 to 2019.3 this morning but one of our workflows has now stopped working.
The Run Command tool is throwing a 193 error when it receives no records. Other Run Command tools run fine with the exact same configuration but only if they receive records. I was able to fix my issue by unioning each line of Run Command tools into a single run command as at least one of the lines will have a record and thus negating the issue. However, this may be useful if anyone else runs into this problem too.