PHP Errors

Hello, I have a problem here. I’m not a webmaster, I do everything by trial and error. When you first installed the plug-in, everything was fine. After a while, the links were gone.

Notice	Undefined index: Купить https://venge.in.ua/magazin	1	wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker.php:144	
+ Toggle button
SEOAutoLinks->SEOAutoLinks_process_text()
Plugin: wpa-seo-auto-linker
Notice	Undefined index: Гостиная https://venge.in.ua/product-category/gostinye	1	wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker.php:144	
+ Toggle button
SEOAutoLinks->SEOAutoLinks_process_text()
Plugin: wpa-seo-auto-linker
Notice	Undefined index: https://venge.in.ua	1	wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker.php:144	
+ Toggle button
SEOAutoLinks->SEOAutoLinks_process_text()
Plugin: wpa-seo-auto-linker
Notice	Undefined index: деская https://venge.in.ua/product-category/detskaia-mebel	1	wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker.php:144	
+ Toggle button
SEOAutoLinks->SEOAutoLinks_process_text()
Plugin: wpa-seo-auto-linker
Notice	Undefined index: https://venge.in.ua/product-category/komody-2	1	wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker.php:144	
+ Toggle button
SEOAutoLinks->SEOAutoLinks_process_text()
Plugin: wpa-seo-auto-linker
Notice	Undefined index: https://venge.in.ua/product-category/krovati-2	1	wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker.php:144	
+ Toggle button
SEOAutoLinks->SEOAutoLinks_process_text()
Plugin: wpa-seo-auto-linker
Notice	Undefined index: https://venge.in.ua/product-category/kuhni	2	wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker.php:144	
+ Toggle button
SEOAutoLinks->SEOAutoLinks_process_text()
Plugin: wpa-seo-auto-linker
Notice	Undefined index: https://venge.in.ua/product-category/miagkaia-mebel	1	wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker.php:144	
+ Toggle button
SEOAutoLinks->SEOAutoLinks_process_text()
Plugin: wpa-seo-auto-linker
Notice	Undefined index: https://venge.in.ua/product-category/matrasy	1	wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker.php:144	
+ Toggle button
SEOAutoLinks->SEOAutoLinks_process_text()
Plugin: wpa-seo-auto-linker
Notice	Undefined index: https://venge.in.ua/product-category/prihozie	1	wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker.php:144	
+ Toggle button
SEOAutoLinks->SEOAutoLinks_process_text()
Plugin: wpa-seo-auto-linker
Notice	Undefined index: https://venge.in.ua/product-category/kupit-spalniu	1	wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker.php:144	
+ Toggle button
SEOAutoLinks->SEOAutoLinks_process_text()
Plugin: wpa-seo-auto-linker
Notice	Undefined index: https://venge.in.ua/product-category/fabrika-mebel-blonski	1	wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker.php:144	
+ Toggle button
SEOAutoLinks->SEOAutoLinks_process_text()
Plugin: wpa-seo-auto-linker
Notice	Undefined index: https://venge.in.ua/product-category/shkafy	1	wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker.php:144	
+ Toggle button
SEOAutoLinks->SEOAutoLinks_process_text()
Plugin: wpa-seo-auto-linker
Notice	Undefined index: https://venge.in.ua/info	1	wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker.php:144	
+ Toggle button
SEOAutoLinks->SEOAutoLinks_process_text()
Plugin: wpa-seo-auto-linker
Notice	Undefined index: https://venge.in.ua/contacts	1	wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker.php:144	
+ Toggle button
SEOAutoLinks->SEOAutoLinks_process_text()
Plugin: wpa-seo-auto-linker
Notice	Undefined index: https://venge.in.ua/kak-vybrat-pravilno-mebel	1	wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker.php:144	
+ Toggle button
SEOAutoLinks->SEOAutoLinks_process_text()
Plugin: wpa-seo-auto-linker