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I have the same error. I have verified, in my wp-config.php file, the WP_Debug is not enabled.
The error appear on a page that is available on the front end.
The error message is :
Warning: Illegal string offset ‘txn_id’ in /XXXXXXXXXX.com/wp-content/plugins/wp-cart-for-digital-products/eStore_post_payment_processing_helper.php on line 269
Line 269 is : eStore_register_link_in_db(”,$download_key,$download_link,”,”,”,0,$payment_data);
It seems to be harmless, but I would like to hide it from visitors.
Thank you for your help.