weird bug when captions activated

First of all, thank you very much for your great plugin.
I am actually having a weird issue with the captions.

In the settings, I put “captions:true” which works great when the images do have one. But as soon as the field is empty, an arrow (→) is displayed instead of nothing.

I tried to check into the plugin files but it doesn’t seem to come from it (I guess). What I understand is that it gets the caption of each image from the title attribute.

Do you have any clue?

https://ww.wp.xz.cn/plugins/bxslider-integration/