With my extensive experience in WordPress, I can confidently offer my services to you in fixing the complications with your "popup maker" plugin. Over my 8 years as a developer, I've had a chance to tackle many issues such as the one you described, and I understand the frustration they can cause. Alongside my proficiency in CSS, JavaScript, and PHP - which have enabled me to build interactive features in various websites - I am confident that we can get your popup to close properly again.
Moreover, my specialty in troubleshooting is another skill that would greatly contribute to your project. Fixing a JavaScript error requires a detail-oriented mindset, coupled with an extensive understanding of how it operates within WordPress plugins. Therefore, I am sure that I can effectively identify and resolve the root cause of the issue.
In conclusion, I offer not just skills but also reliability, dedication, and prompt communication. Superb results delivered on time is my mantra for every project, no matter how complex they might seem. Therefore, don't hesitate to entrust this task with me; I guarantee quality work at a flexible price. Let's fix this popup problem together and establish a long-term relationship for any future assistance!