belongsToMany issue

i 've a strange assoc problem:

class Achievements

{

        $this->belongsToMany('SocialUsers', [

            'foreignKey' => 'achievement_id',

            'targetForeignKey' => 'user_id',

            'joinTable' => 'achievements_users',

            'through'=>'AchievementsUsers'

        ]);

 ...

if i delete all cache i raise error:

 Column not found: 1054 Unknown column 'AchievementsUsers.social_user_id' in 'field list' 

but if i reload the page all works fine ( until the next cache delete)

It's like targetForeignKey was not readed first time execution.

I've a lot of this belongsToMany but only here there is this issue

Some suggests?!

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