Notice: Undefined index: contact-form-7

Try switching to the default theme (twentyfifteen) and deactivating all other plugins.

Takayuki, I can’t switch themes. This is a custom theme, and it’s the live site for a corporate client. Frankly, I’m concerned that changing themes will re-arrange content on pages, change plugins, etc. … and I don’t have the technical expertise to be able to put things back to where they are now.

Surely there’s a solution that doesn’t involve changing themes on a live site. Anyone?

Takayuki, is there something I need to edit on line 250 of some file? If so, please tell me how to access that file and what to do.

Or … can I just go back to the previous version of this plugin that was working?

I’m still needing help with this.
This is a live corporate site that now shows an error in the header – ever since updating this Contact Form 7 plugin.

https://www.kilowattfinancial.com/

Don’t you have a testing environment?

We do.
https://staging.kilowattfinancial.com

We inadvertently updated the plugin on the LIVE site instead of the staging site. Now the live site is the one with the error. The staging site still has the older version of the plugin.

Is there a way to take the live site back to the former version of the plugin?

@takayuki, here are lines 241-258 of the .php file that’s referenced in the error msg:

}

	/**
	 * @param string $handle    Name of the item. Should be unique.
	 * @param bool   $recursion Internal flag that calling function was called recursively.
	 * @param mixed  $group     Group level.
	 * @return bool Not already in the group or a lower group
	 */
	public function set_group( $handle, $recursion, $group = false ) {
		if ( $this->registered[$handle]->args === 1 )
			$grp = 1;
		else
			$grp = (int) $this->get_data( $handle, 'group' );

		if ( false !== $group && $grp > $group )
			$grp = $group;

		return parent::set_group( $handle, $recursion, $grp );

Line 250: if ( $this->registered[$handle]->args === 1 )

To hide the error on your live site, set WP_DEBUG to false.

@Ov3erfly
Thanks for this. So this will just hide the error but not necessarily fix the problem, right Should I be concerned about the error then?

Also, I’m having a tough time finding the WP_DEBUG file. Where do I go for that?

@ov3rfly – okay, I found the WP_DEBUG file and set it to false, but am still seeing the error on my home page. What next?
https://www.kilowattfinancial.com/

You are using WP Super Cache plugin, clear your page cache.

i use Chrome. Just cleared everything with “kilowatt” from my browsing history. Am still seeing the error. Same on my iPhone browser (Safari).