insert a column causes an exception in firefox

Steps to Reproduce

1. import the attached file with firefox
2. insert a column at D

Current Result

on screen

Failed to process
setAttr
[Exception... "Component is not available" nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)" location: "JS frame :: http://localhost:8080/support/zkau/web/_zv5.10.0/js/zss.wpd :: zcss._setRuleProperty :: line 42939" data: no] (NS_ERROR_NOT_AVAILABLE)

in console

[email protected]http://localhost:8080/support/zkau/web/_zv5.9.0/js/zss.wpd:42864:15
[email protected]http://localhost:8080/support/zkau/web/_zv5.9.0/js/zss.wpd:42720:10
[email protected]http://localhost:8080/support/zkau/web/_zv5.9.0/js/zss.wpd:19205:11
[email protected]http://localhost:8080/support/zkau/web/_zv5.9.0/js/zssex.wpd:4502:18
[email protected]http://localhost:8080/support/zkau/web/_zv5.9.0/js/zssex.wpd:4994:29
[email protected]http://localhost:8080/support/zkau/web/_zv5.9.0/js/zss.wpd:18167:12
[email protected]http://localhost:8080/support/zkau/web/_zv5.9.0/js/zss.wpd:40720:20
[email protected]http://localhost:8080/support/zkau/web/_zv5.9.0/js/zss.wpd:38031:11
[email protected]http://localhost:8080/support/zkau/web/_zv5.9.0/js/zss.wpd:12387:17
[email protected]http://localhost:8080/support/zkau/web/_zv5.9.0/js/zss.wpd:12659:13
defSet01/<@http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:9781:15
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:10857:38
_setterName/[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:21625:18
zk.Widget<[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:21659:28
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:31144:15
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:29265:10
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:29388:20
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:29833:26
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:30425:11
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:30249:11
ajaxSendNow/</<@http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:29358:13
promise callback*ajaxSendNow/<@http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:29355:23
promise callback*[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:29354:39
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:30097:31
ajaxSend2/<@http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:29315:11
setTimeout handler*[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:29314:39
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:29309:14
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:29676:17
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:24323:68
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:11670:18
[email protected]http://localhost:8080/support/zkau/web/_zv5.9.0/js/zss.wpd:13889:8
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:24267:41
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:24362:19
[email protected]http://localhost:8080/support/zkau/web/_zv5.9.0/js/zss.wpd:13500:8
[email protected]http://localhost:8080/support/zkau/web/_zv5.9.0/js/zss.wpd:16830:10
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:24246:34
[email protected]http://localhost:8080/support/zkau/web/_zv2022011111/js/zul.menu.wpd:1455:16
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:27809:43
@http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:28034:33
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:4869:98
add/[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:4689:109
EventListener.handleEvent*[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:4730:20
_on/<@http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:4633:20
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:414:24
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:254:21
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:4632:17
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:5297:14
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:12720:26
jQuery.fn[name]@http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:9557:42
@http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:28022:6
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:3434:36
Deferred/then/resolve/</process<@http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:3476:19
setTimeout handler*Deferred/then/resolve/<@http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:3511:24
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:3206:33
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:3323:13
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:3331:14
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:3206:33
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:3323:13
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:3675:17
[email protected]http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:3683:12
EventListener.handleEvent*@http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:3695:14
@http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:124:12
@http://localhost:8080/support/zkau/web/cee6fb92/js/zk.wpd:127:3

Expected Result

a column inserted without an error

Debug Information

• Chrome doesn't have this error but the border-top is missing after insertion
  
• it only happens when a cell with a border and the cell's top or right has a merged cell.