Fatal error: Call to a member function get() on a non-object in… /wp-includes/

@tizz: To confirm, the error was only triggered from a conflict with the other plugin? So if *either* plugin is deactivated, it seems to go away? Also, can you confirm where the error was showing – just on that archive page?

Thanks for the info and troubleshooting. I’ll be sure to get this on to our higher priority list.

@tizz: Just installed this plugin and couldn’t generate the error. Can you tell me if there’s a specific shortcode from W4 that you are running on the page with the error?

Hi Photocrati, thanks very much for replying to this.
Sorry for the delay (for the time zone difference).
I built in admin two archive lists with two shortcodes generated by the W4 plugin [postlist 1] and [postlist 3].
I haven’t these shortcodes pasted in a page but I created a simple custom template to display these posts lists in two colums (I can confirm that the error isn’t in the template), this, and it has always worked well.
So, I had an empty page with that template chosen from the dropdown list and it has always worked as expected.
Soon after Nextgen last upgrade that page has showed only that error.
Before the deactivating test, I tried to choose other theme default templates and paste plugin shortcodes in the page, all templates work as above (I mean the layout and background are there, the page isn’t blank, but no WP admin bar and no footer) and show that error. The W4 plugin with Nextgen activated doesn’t works in any way and with Nextgen deactivated works with my archive page displayed as usual.
With W4 deactivated and Nextgen activated, the fatal error is always there if I keep the template with W4 shortcodes.
In the meantime I’ve done another quick normal archive page (without the call to plugin code) to avoid showing the page with the error and to keep Nextgen on.
Sidenote:
W4 plugin show in his admin the infamous warning, I don’t think (or I don’t know) if it’s related but I say it anyway.

Hi again, here some shots with default theme on a test site.
No others plugins activated but NextGen and W4 post list, put in an empty page [postlist 1], with a base template, the result is this, and with W4 deactivated it’s the same.
With Nextgen deactivated too no error
With W4 activated alone the request archive is displayed.

I found out the same error in this topic

Thanks for you attention

Sorry, I’m here again with another note.
Since the problem has occurred with the latest version, this could be the case?
V2.0.33 – 10.21.2013
Fixed: PHP notice: Attempt to assign property of non-object

@tizz: From what you are saying in your responses above, it looks to me like this error is occurring for you in NextGEN 2.0.33 regardless of whether W4 is active or not. So it looks like a straight issue with NextGEN rather than a plugin conflict? Just want to confirm I’m understanding that correctly.

As you referenced, we’ve seen at least two users with this. So we already have an issue for the developers, and our developer already resolved it on one site. It was a very odd issue that seemed specific.

I’m going to add your details now. I will say that if you are willing to provide WP and FTP credentials, I’ll ask the developer to login and resolve this for you directly. Otherwise, we’ll work on trying to identify a general fix we can roll out. The only issue is we can’t duplicate the error, so it’s hard to find a general solution for it. So if you’re willing to provide creds, that would obviously be a big help. Thanks! (Erick)

https://www.nextgen-gallery.com/report-bug/

PS. The thread you referenced had a quick fix in it. Did you try and did it work for you?

The thread you referenced had a quick fix in it. Did you try and did it work for you?

Hi Photocrati, thank you for replying. I haven’t considered that fix because it means touch the WP core and I never do, for no reason.
In the meantime I prefer make another page template manually from scratch to display my archive lists, as I did right now, I have to refine it but at this point I could give up the W4 plugin, so I’ll solve my problem.
But I would like also understand why the error occur.

When I say that even with W4 deactivate – and Nextgen activated – the error occurs is because that page (the error is only on that page) has a template with the plugin code embedded (<?php w4_post_list( '1' ) ?>), and it’s the same if I use the standard template with the default theme and W4 shortcode directly in the page.
Only with Nextgen deactivated there’s no error.

Anyway it’s easier to understand if you directly see, so I’ll open a report bug giving credits, but first I’ll duplicate the situation in a test site because I’d rather leave the one in production as it is, as I said above I just made a new archive page, and I don’t like to give around my creds.

OK, bug report has been sent.

@tizz: thanks for the additional details, and I confirm we’ve received that bug report. Thanks!

Solved by the Photocrati team.

well, not solved at all – I dont have much experienc with webmastering and opening my site today to see this f* error got my bulistic; thank you “tizz” for posting this error; ive just deactivated “NextGEN Gallery by Photocrati” and my site is working good again – thank you nextgen for my brain-storm today; I admire people who make plugins, but guys, we are using then cause we are ignorant, so pls have that on mind when testing plugins or creating them – you are the experts, right?!!

@muahaaateam you’d better open a bug report at the address above.