Do not dereference null pointer on learning.
Do not dereference null pointer on learning.

amohanta/rspamd,andrejzverev/rspamd,AlexeySa/rspamd,minaevmike/rspamd,minaevmike/rspamd,dark-al/rspamd,amohanta/rspamd,AlexeySa/rspamd,andrejzverev/rspamd,dark-al/rspamd,andrejzverev/rspamd,amohanta/rspamd,andrejzverev/rspamd,amohanta/rspamd,andrejzverev/rspamd,andrejzverev/rspamd,dark-al/rspamd,AlexeySa/rspamd,dark-al/rspamd,andrejzverev/rspamd,minaevmike/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,andrejzverev/rspamd,minaevmike/rspamd,minaevmike/rspamd,minaevmike/rspamd,dark-al/rspamd,minaevmike/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,amohanta/rspamd,minaevmike/rspamd,minaevmike/rspamd