PHP Warning in Import/Export area

I am receiving same error as well on my Import/Export page.

WordPress version
4.4.2

Plugin version
1.0.4

Heres the System info

### Begin System Info ###

— Site Info

Site URL: http://pitaj.online
Home URL: http://pitaj.online
Multisite: No

— User Browser

Platform: Windows
Browser Name: Chrome
Browser Version: 48.0.2564.116
User Agent String: Mozilla/5.0 (Windows NT 10.0; WO
W64) AppleWebKit/537.36 (KHTML,
like Gecko) Chrome/48.0.2564.116
Safari/537.36

— WordPress Configuration

Version: 4.4.2
Language: en_US
Permalink Structure: /%year%/%monthnum%/%day%/%postname%/
Active Theme: Academica 2.0
Show On Front: posts
Remote Post: wp_remote_post() works
Table Prefix: Length: 3 Status: Acceptable
WP_DEBUG: Disabled
Memory Limit: 40M
Registered Post Stati: publish, future, draft, pending, private, trash, auto-draft, inherit

— QUADS Configuration

Version: 1.0.4
Upgraded From: None

— WordPress Active Plugins

AccessPress Anonymous Post: 2.5.1
Add Meta Tags: 2.10.9
CloudFlare: 1.3.20
Facebook Comments Plugin: 2.3.3
Gallery Lightbox Lite: 1.0.0.25
Google Adsense Dashboard: 2.2.1
Google Analytics Dashboard for WP: 4.9.2
Mango Buttons: 1.2.8
Menu Icons: 0.9.2
NextGEN Facebook (NGFB): 8.25.0
Real-Time Find and Replace: 3.6
Social Sharing Buttons: 2.2.4
Top Bar: 1.2
WP QUADS – Quick AdSense Reloaded: 1.0.4
XML Sitemap & Google News feeds: 4.5.1

— WordPress Inactive Plugins

Google AdSense: 1.2.1
Photo Gallery: 1.2.89

— Webserver Configuration

PHP Version: 5.4.34
MySQL Version: 5.5.48
Webserver Info: Apache

— PHP Configuration

Safe Mode: Disabled
Memory Limit: 256M
Upload Max Size: 32M
Post Max Size: 32M
Upload Max Filesize: 32M
Time Limit: 30
Max Input Vars: 1000
Display Errors: On (1)

— PHP Extensions

cURL: Supported
fsockopen: Supported
SOAP Client: Not Installed
Suhosin: Not Installed

### End System Info ###

Fixed in latest version. Thanks for the logs.

New update with another fix for this is coming today

@danieliser

That is the broken code:

if ( is_plugin_inactive( $plugin_file ) ) {
        $plugin_data = get_plugin_data( $plugin_abs_path, $markup = true, $translate = true );

        if ($plugin_data['Version'] === $checkVersion){
            return true;
}
    }

and the fixed one:

if ( file_exists( $plugin_abs_path ) && is_plugin_inactive( $plugin_file ) ) {
        $plugin_data = get_plugin_data( $plugin_abs_path, $markup = true, $translate = true );

        if ($plugin_data['Version'] === $checkVersion){
            return true;
}
    }

As you can see in the first example get_plugin_data() is executed even if the plugin is not installed at all.

I bet you have a similar missing file_exists() condition.