In libjanet you can use a C call like janet_panic() that'll "panic" and throw an exception/error up in the active Janet runtime (so when something bad/unexpected happens in your C code you are providing an API to from Janet, you'd use this).
That is like saying Scheme does not have exceptions, except in C, we have setjmp instead of call/cc. It is technically correct, but there is something more flexible that can be perverted into doing the same thing.