A dynamic type system is an incremental improvement over a weakly typed type system, and still will not guard against runtime errors. They are equally dangerous w.r.t runtime errors.
Technically speaking, even languages with strong safeguards (random examples: Golang, Rust) can't "guard against runtime errors", because it's possible to panic a program by performing an out-of-bounds array access (which classifies as "runtime error" in a very strict sense).
A concept that makes sense is the amount of safeguards provided by a language (/type system), however, this depends entirely on the use case; it's an intentional choice of the developer.