From Longman Dictionary of Contemporary Englishbe an open invitation for/to somebodybe an open invitation for/to somebodyCARELESSto make it very easy for someone to rob you or harm you Leaving the car unlocked is just an open invitation to thieves. → invitation
Examples from the Corpus
be an open invitation for/to somebody• Leaving the car unlocked is just an open invitation to thieves.• The Carter team feared that the remark and the attitude it conveyed would be an open invitation to execute Kim. 