Segfault after updating from PHP 5.6 to 7.0

[Tristan]

Decided to update a Debian 6 box to PHP 7:

Wrote PEAR system config file at: /usr/local/etc/pear.conf
You may want to add: /usr/local/lib/php to your php.ini include_path
/usr/local/directadmin/custombuild/php-7.0.4/build/shtool install -c ext/phar/phar.phar /usr/local/bin
ln -s -f phar.phar /usr/local/bin/phar
Installing PDO headers:           /usr/local/include/php/ext/pdo/
Copying php.ini..
/usr/local/lib/php.ini already exists, skipping.
Enabling  mail.add_x_header option in /usr/local/lib/php.ini
PHP 7.0.4 Installed.
Stopping httpd: 
Remaining processes: 16507
Stopping httpd: 
Starting httpd: [Tue Mar 15 12:50:33.490594 2016] [so:warn] [pid 377] AH01574: module php5_module is already loaded, skipping
/etc/init.d/httpd: line 58:   377 Segmentation fault      $httpd -k start -DSSL

root@server12:/usr/local/directadmin/custombuild# /etc/init.d/httpd restart
Stopping httpd: 
Starting httpd: [Tue Mar 15 12:51:48.675764 2016] [so:warn] [pid 2873] AH01574: module php5_module is already loaded, skipping
/etc/init.d/httpd: line 58:  2873 Segmentation fault      $httpd -k start -DSSL

Is this a known problem maybe with 7.0.4 or with CB 2.0, Debian 6 and PHP 7 in general?