Slider bug

Hi guys,

I’ve just started using your plugin and I have a little issue, which I suspect might be related to my theme. I’m using Trail, a premium theme from Themetrust.

Although my slider with 3 slides on the homepage seems to work perfectly fine, about one time out of ten or so, when I test it, after I get to slide number 3, it won’t go further anymore (usually I can loop back to 1 and keep going forever), I can’t go back to slide 1, and if I go backwards with the arrow, I can see slide 2, but not slide 1, as slide 2 will also replace slide 1, so it’s doubled… I can get back to slide 3, but I can never go back to slide 1. Plenty of times, it works just fine when I test it, but surely the issue comes back randomly. Very difficult to try with another theme since it’s so random. Oh, and I can’t have you try it for yourself as my site is in the under construction mode and I can’t deactivate that for now.
Any idea where this could be coming from? I know almost nothing about coding and whatnot but when I looked at the java console, it had this error message, maybe you can tell me if it’s related (thanks in advance!):

jquery-migrate.min.js?ver=1.4.1:2 JQMIGRATE: Migrate is installed, version 1.4.1
tt_sc_functions.js:23 false false
theme_trust.js?ver=1.0:136 Uncaught TypeError: Cannot read property ‘hasClass’ of null
at slideshowScroll (https://www.erwanji.com/wp-content/themes/trailthemetrust/js/theme_trust.js?ver=1.0:136:17)
at dispatch (https://www.erwanji.com/wp-includes/js/jquery/jquery.js?ver=1.12.4:3:12444)
at r.handle (https://www.erwanji.com/wp-includes/js/jquery/jquery.js?ver=1.12.4:3:9173)
at Object.trigger (https://www.erwanji.com/wp-includes/js/jquery/jquery.js?ver=1.12.4:3:11573)
at Object.a.event.trigger (https://www.erwanji.com/wp-includes/js/jquery/jquery-migrate.min.js?ver=1.4.1:2:8275)
at https://www.erwanji.com/wp-includes/js/jquery/jquery.js?ver=1.12.4:3:18991
at Function.each (https://www.erwanji.com/wp-includes/js/jquery/jquery.js?ver=1.12.4:2:2881)
at a.fn.init.each (https://www.erwanji.com/wp-includes/js/jquery/jquery.js?ver=1.12.4:2:846)
at a.fn.init.trigger (https://www.erwanji.com/wp-includes/js/jquery/jquery.js?ver=1.12.4:3:18967)
at a.fn.init.n.fn.(anonymous function) [as scroll] (https://www.erwanji.com/wp-includes/js/jquery/jquery.js?ver=1.12.4:4:16320)
37theme_trust.js?ver=1.0:136 Uncaught TypeError: Cannot read property ‘hasClass’ of null
at slideshowScroll (theme_trust.js?ver=1.0:136)
at dispatch (jquery.js?ver=1.12.4:3)
at r.handle (jquery.js?ver=1.12.4:3)