Execs keeps running after puppet run failed

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It has happened to me some times already, puppet run completes with errors and apt gets locked due to "zombie" processes still running...

exec { "purge-apparmor":
      command => "apt-get purge ${apparmor::params::apparmor_package_name}",
    }

err: /Stage[main]/Apparmor::Install/Exec[purge-apparmor]/returns: change from notrun to 0 failed: apt-get purge -y apparmor returned 100 instead of one of [0] at /etc/puppet/environments/development/modules/apparmor/manifests/install.pp:40



# apt-get purge apparmor
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

# ps ...