I found the exceptions are shown in jqxTreeGrid. jqxGrid is normal, when I use same data and data adapter.
Also it was weired because the problem can’t reproduce in JSFiddle…
So I changed the new version of jquery and jqx-all.js.
And then, the exceptions are not shown anymore.
jquery version 1.10.2 -> 1.11.1.
jqwidgets version 3.2.2. -> 3.4.0.
Anyway, thank you for your reply 🙂