backtrace runs twice when a function fails

[Elsie19]

File

#!/bin/bash
source ../base/backtrace.sh

function doomed_to_fail() {
    touch /root/test
}

doomed_to_fail

Output

touch: cannot touch '/root/test': Permission denied
Traceback (most recent call last):
  File "./test.sh", line 9, in main
    doomed_to_fail
  File "./test.sh", line 6, in doomed_to_fail
    touch /root/test
Exiting with status 1
Traceback (most recent call last):
  File "./test.sh", line 9, in main
    doomed_to_fail
Exiting with status 1