Javascript error "no element found" happens on firefox 36

Steps to reproduce

1. run zssapp.war in zssee-app-eval-3.8.0-FL-2015-03-09
2. open firefox developer tool, Console tab
3. type anything in a cell, like 1 in A1

Actual Result

several javascript errors "no Element Found" happen.

Debug Information

• it doesn't affect normal function working.
• That URL in comet:1:1 is http://localhost:8080/zssapp/zkau/comet?dtid=z_ko5
• Chrome and IE10 doesn't have such issue