Steps to Reproduce

1. Click Reload center area to load the content
2. Scroll to tab number 50 or something
3. Click Reload center area to reload the content. Check the console in chrome developer tools.

Current Result

zul.tab.wpd:964 Uncaught TypeError: Cannot set property 'scrollLeft' of null
at init._fixTabsScrollLeft (zul.tab.wpd:964)
at goscroll (zul.tab.wpd:775)
at zul.tab.wpd:798
_fixTabsScrollLeft @ zul.tab.wpd:964
goscroll @ zul.tab.wpd:775
(anonymous) @ zul.tab.wpd:798
setInterval (async)
_doScroll @ zul.tab.wpd:791
_scrollcheck @ zul.tab.wpd:733
onSize @ zul.tab.wpd:575
_invoke @ zk.wpd:16465
fire @ zk.wpd:16448
_fire @ zk.wpd:16591
fireDown @ zk.wpd:16808
fireDown @ zk.wpd:18568
fireSized @ zk.wpd:19377
vflex @ zk.wpd:20453
(anonymous) @ zk.wpd:11277
_setFirstChildFlex @ zul.layout.wpd:390
unbind_ @ zul.layout.wpd:1022
unbindChildren_ @ zk.wpd:22729
unbind_ @ zk.wpd:22691
unbind_ @ zkbind.wpd:44
$supers @ zk.wpd:12956
unbind_ @ zul.layout.wpd:124
unbindChildren_ @ zk.wpd:22729
unbind_ @ zk.wpd:22691
unbind_ @ zkbind.wpd:44
unbind @ zk.wpd:22571
removeChildHTML_ @ zk.wpd:22367
removeChild @ zk.wpd:21111
detach @ zk.wpd:21131
rm @ zk.wpd:28814
doProcess @ zk.wpd:27085
doCmdsNow @ zk.wpd:27187
_doCmds @ zk.wpd:27554
afterResponse @ zk.wpd:28061
_onResponseReady @ zk.wpd:27916
XMLHttpRequest.send (async)
ajaxSendNow @ zk.wpd:27157
sendNow @ zk.wpd:27782
(anonymous) @ zk.wpd:27127
setTimeout (async)
ajaxSend2 @ zk.wpd:27127
ajaxSend @ zk.wpd:27121
send @ zk.wpd:27426
sendAU_ @ zk.wpd:23353
fireX @ zk.wpd:23291
fire @ zk.wpd:23392
fireOnSelect @ zul.sel.wpd:1026
_select @ zul.sel.wpd:861
_doItemSelect @ zul.sel.wpd:594
doSelect_ @ zul.sel.wpd:1512
doSelect_ @ zk.wpd:23640
doSelect_ @ zk.wpd:23640
_doEvt @ zk.wpd:26475
(anonymous) @ zk.wpd:26675
dispatch @ zk.wpd:5410
elemData.handle @ zk.wpd:5062

Expected Result

no error

Workaround

• assign a model to Tabbox
• js patch