Bug#926719: SFTP ProFTPD terminating (signal 11) after Update to 1.3.5e-0+deb8u1

[Timo Müller]

Package: proftpd-basic
Version: 1.3.5e-0+deb8u1

After the upgrade to 1.3.5e-0+deb8u1 is the login to the sftp server no longer possible.

$ sftp XXXXXXXX at 172.31.XXX.XXX

/var/log/proftpd/proftpd.log
2019-04-09 16:21:26,683 XXXXXXXXXX proftpd[11976] 172.31.XXX.XXX (172.31.XXX.XXX[172.31.XXX.XXX]): SSH2 session opened.
2019-04-09 16:21:27,797 XXXXXXXXXX proftpd[11976] 172.31.XXX.XXX (172.31.XXX.XXX[172.31.XXX.XXX]): USER XXXXXXXXXXX: Login successful
2019-04-09 16:21:27,797 XXXXXXXXXX proftpd[11976] 172.31.XXX.XXX (172.31.XXX.XXX[172.31.XXX.XXX]): ProFTPD terminating (signal 11)
2019-04-09 16:21:27,798 XXXXXXXXXX proftpd[11976] 172.31.XXX.XXX (172.31.XXX.XXX[172.31.XXX.XXX]): SSH2 session closed.

I am using Debian 8.11 
Linux 3.16.0-8-amd64 #1 SMP Debian 3.16.64-2 (2019-04-01) x86_64 GNU/Linux