I think that one need to change $.fmatter.isUndefined(cellValue) to cellValue === undefined. See the commit. The corresponding demo is here.

Regards
Oleg

Hallo Tony,

I want first remind you that the problem is not yet fixed in the code of jqGrid on github. Additionally I found that getLocalRow don't call $.jgrid.stripPref method. It seems wrong.

If would be good to search for all cases of usage “.p._index[” in the code of jqGrid and to follow one common way of usage rowid and indexes in _index. The most close to the current code is the way where data parameter are used directly to specify input data and some non-empty idPrefix are specified. In the case id without idPrefix

Hello Tony,

I have seen the changes in TreeGrid. In any way one have to use one way of saving ids in _index. The most methods (like addRowData and setRowData) use the fact that _index contains ids with stripped prefix (see here and this lines together with another one

Just one remark. The simple answer