MINERVANET - Error Report #34 - removing project twice throws 500

id: 34
url: https://pg-sandbox.uni.lu/minerva/admin.xhtml?id=pd_map_spring_18#
login: ewa.smula
email: ewa.smula@uni.lu
browser: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0.3 Safari/605.1.15
timestamp: 2019-02-18T10:15:08Z
version: 12.2.0~beta.1
comment: 
stacktrace: Error: https://pg-sandbox.uni.lu/minerva/api/projects/ rejected with status code: 500
    NetworkError@https://pg-sandbox.uni.lu/minerva/javax.faces.resource/minerva.js.xhtml?ln=js&m_version=c16fe7092b7ebece353383a932d997bacf7d4648:233446:26
    callback@https://pg-sandbox.uni.lu/minerva/javax.faces.resource/minerva.js.xhtml?ln=js&m_version=c16fe7092b7ebece353383a932d997bacf7d4648:206406:27
    emit@https://pg-sandbox.uni.lu/minerva/javax.faces.resource/minerva.js.xhtml?ln=js&m_version=c16fe7092b7ebece353383a932d997bacf7d4648:30456:21
    emit@https://pg-sandbox.uni.lu/minerva/javax.faces.resource/minerva.js.xhtml?ln=js&m_version=c16fe7092b7ebece353383a932d997bacf7d4648:30453:21
    g@https://pg-sandbox.uni.lu/minerva/javax.faces.resource/minerva.js.xhtml?ln=js&m_version=c16fe7092b7ebece353383a932d997bacf7d4648:30537:21
    emit@https://pg-sandbox.uni.lu/minerva/javax.faces.resource/minerva.js.xhtml?ln=js&m_version=c16fe7092b7ebece353383a932d997bacf7d4648:30468:25
    endReadableNT@https://pg-sandbox.uni.lu/minerva/javax.faces.resource/minerva.js.xhtml?ln=js&m_version=c16fe7092b7ebece353383a932d997bacf7d4648:219386:16
    afterTickTwo@https://pg-sandbox.uni.lu/minerva/javax.faces.resource/minerva.js.xhtml?ln=js&m_version=c16fe7092b7ebece353383a932d997bacf7d4648:166333:14
    run@https://pg-sandbox.uni.lu/minerva/javax.faces.resource/minerva.js.xhtml?ln=js&m_version=c16fe7092b7ebece353383a932d997bacf7d4648:166506:19
    drainQueue@https://pg-sandbox.uni.lu/minerva/javax.faces.resource/minerva.js.xhtml?ln=js&m_version=c16fe7092b7ebece353383a932d997bacf7d4648:166476:45
>From previous event:
    _sendRequest@https://pg-sandbox.uni.lu/minerva/javax.faces.resource/minerva.js.xhtml?ln=js&m_version=c16fe7092b7ebece353383a932d997bacf7d4648:233946:21
>From previous event:
    sendRequest@https://pg-sandbox.uni.lu/minerva/javax.faces.resource/minerva.js.xhtml?ln=js&m_version=c16fe7092b7ebece353383a932d997bacf7d4648:233914:65
    getProjects@https://pg-sandbox.uni.lu/minerva/javax.faces.resource/minerva.js.xhtml?ln=js&m_version=c16fe7092b7ebece353383a932d997bacf7d4648:234914:31
    onRefreshClicked@https://pg-sandbox.uni.lu/minerva/javax.faces.resource/minerva.js.xhtml?ln=js&m_version=c16fe7092b7ebece353383a932d997bacf7d4648:246577:37
>From previous event:
    promiseReactionJob@[native code]
.

by @ewa.smula