An ajax http request terminated abnormally during picture upload

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This error occurs usually during a file upload and when you try to check the Drupal logs you will find error something like this -
"PDOException: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '' for key 2: INSERT INTO {file_managed}."

Usually if you remove the white spaces from your filename which you are uploading will solve this error . So for example if you have a filename like "tech rappers.jpg" then try changing the filename to "techrappers.jpg" or tech-rappers.jpg" will solve this error.

Alternatively, you can use the below module also :

https://www.drupal.org/project/upload_qc