topic Re: 'qva' is null problem in QlikView

'qva' is null problem

rwunderlich — Mon, 26 Jan 2026 18:19:17 GMT

The IE7 on my laptop is suddenly unable to use the QEMC or QMC pages. I receive a javascript error

'qva' is null or undefined,.

This also happens with the qliktech download site and demo site as well.

Any ideas of what happened / what I need to tweak?

Thanks,
-Rob

'qva' is null problem

vgutkovsky — Thu, 21 Jan 2010 02:46:16 GMT

Rob,

'qva' is defined in \QlikView\Management Service\QMCCommon\QvAjaxZfc\htc\QvAjax.js and \QlikView\Server\QvClients\QvAjaxZfc\htc\QvAjax.js, which is in turn defined in almost every file either directly or through \QlikView\Management Service\QMCCommon\Includes.js. Have any of these files been modified?

Also make sure that your user account has NTFS read & execute permissions on all relevant QVS folders since that could mean that your access to the javascript files is being blocked. Finally, check to make sure your IE security settings are not too high.

Regards,

'qva' is null problem

rwunderlich — Thu, 21 Jan 2010 07:41:59 GMT

Vlad,

Thanks for the response. I've finally found the problem. I recently installed the Google Chrome Frame plugin -- in response to some prompt or another -- can't remember why. The installation of this component caused the string "chromeframe" to appear in my IE UserAgent header. Here's my full header:

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; GTB6.3; chromeframe; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

QvAjax.js tests for the Chrome browser like this:
IS_CHROME = navigator.userAgent.toLowerCase().indexOf("chrome") != -1;

which incorrectly caused the code to assume the browser was Chrome, not IE, which caused problems in the conditional paths

I tried to work around the problem by uninstalling the Chrome Frame plugin, Alas, this did not remove "chromeframe" from the UserAgent, but I found this entry on the web

http://stackoverflow.com/questions/2005270/how-can-i-remove-chromeframe-from-ie8-user-agent

that told me how to remove it with a registry edit.

I'll report this as a bug.

Thanks,
-Rob

'qva' is null problem

vgutkovsky — Thu, 21 Jan 2010 17:08:17 GMT

Thanks for sharing the solution!

'qva' is null problem

Thu, 18 Feb 2010 22:22:18 GMT

Rob, Thank-You!!!!!

This worked for me.

One of my C's was the only user that had this problem. I was pulling my hair out trying to figure it out. You saved my tail

thanks again

'qva' is null problem

jacekvsp — Tue, 20 Sep 2011 20:45:32 GMT

Asking large number of non-technical users to edit registry may be rather scary thought.

One of our clients had this issue and we have resolved it by simply resetting IE settings:

Re: 'qva' is null problem

Mon, 19 Nov 2012 21:17:27 GMT

An uninstall of Chrome Frame plugin worked for my customer

Re: 'qva' is null problem

Bill_Britt — Tue, 20 Nov 2012 13:21:05 GMT

Rob,

Qlikview look at this and decide it was a third party bug and there wasn't nothing we could do to make it work.

Bill

Re: 'qva' is null problem

montubhardwaj — Thu, 18 Jul 2013 21:14:32 GMT

One of my user also had same issue and I resolved it by just re-setting IE settings. Thanks for the solution.