slugn何か文字列を自分で入れることによって解決した。
SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '' for key 'conference.UNIQ_911533C8989D9B62'
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Symfony migrate時のエラー SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '' for key 'conference.UNIQ_911533C8989D9B62'
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