[1.20.0] 'sed' segfaults while trying to match wildcards

[Tomasz Czapiewski]

# echo "anything" | sed 's/\t*//g'
Segmentation fault

# echo "anything" | sed 's/\t//g'
anything

# echo "anything" | sed 's/a*//g'
Segmentation fault

Worked fine on 1.19.3.

Regards,
Tomasz Czapiewski