TE sending duplicate item Ids

[rafaelnajera]

For some reason the editor sent duplicate item id. This is the log

[2017-11-29 18:08:45] API.ERROR: Duplicate Item id : -1004 {"apiUserId":"23977","apiError":1010,"docId":18,"pageNumber":382,"columnNumber":1,
"itemIndex":0,"elementArray":
{"id":4,"pageId":7511,"columnNumber":1,"lang":"he","editorId":23977,"handId":0,"type":1,"seq":3,"items":
[
{"id":-1004,"columnElementId":4,"seq":0,"type":8,"lang":"he","theText":"השנמות","altText":null,"extraInfo":"strikeout","length":null,"target":null},
{"id":-1,"columnElementId":4,"seq":1,"type":1,"lang":"he","theText":" ובעבור זה לא יתחייב שיהיה ","altText":null,"extraInfo":null,"length":null,"target":null},
{"id":-1005,"columnElementId":4,"seq":2,"type":7,"lang":"he","theText":"ה","altText":null,"extraInfo":"above","length":null,"target":-1},
{"id":-1,"columnElementId":4,"seq":3,"type":1,"lang":"he","theText":"מניע הראשון ימשש","altText":null,"extraInfo":null,"length":null,"target":null}],
"reference":null,"placement":null}} 

{"url":"/apm/api/18/382/1/elements/update","ip":"89.176.114.21","http_method":"POST","server":"averroes.uni-koeln.de","referrer":"http://averroes.uni-koeln.de/apm/doc/18/page/382/view"}

Tamas eventually was able to save. This is a screenshot of the first lines of the column:

It seems that the culprit was the deletion in line 4.

(reported by Tamás)