Empty Textbox appears at TimelineEnd for a short duration, bug

[eljii]

hey, I'm currently using two styles in my project. One TextBubble Style and one classic Portrait style.
The second one works just fine, but always when my TextBubble Timelines end a portrait style Textbox appears, which is empty, for 0.5 seconds and disappears again.

I'm not starting any new timelines, I already tried to debug my code but it's linked to the timeline_end event of the BubbleText and I don't know how to get that out.

Does someone have any ideas? :s
Thank you guys.