JFoenix JFXTextField NullPointerException when added to my application

Question

Whenever I add a JFXTextField to my application, when I try to compile it I get:

java.lang.NullPointerException
    at com.jfoenix.skins.JFXTextFieldSkin.updateTextPos(JFXTextFieldSkin.java:109)
    at com.jfoenix.skins.JFXTextFieldSkin.layoutChildren(JFXTextFieldSkin.java:93)
    at javafx.controls/javafx.scene.control.Control.layoutChildren(Control.java:601)
    at javafx.graphics/javafx.scene.Parent.layout(Parent.java:1206)
    at javafx.graphics/javafx.scene.Parent.layout(Parent.java:1213)
    at javafx.graphics/javafx.scene.Parent.layout(Parent.java:1213)
.........

I don't try to use it or anything. Simply adding it. Everything else seems to work with no issues. If I were to remove it, the program compiles fine and works.

I went to .updateTextPos(), but I don't really understand what's causing it.

I found a problem similar to mine, but the error is different. Should I do what's suggested there as well anyway? I'd rather not mess with the whole library since I don't have that much knowledge.