When writing in a paragraph, the following explosion happens. As a result, the display is going back up.

Exception in thread "JavaFX Application Thread" java.lang.ArrayIndexOutOfBoundsException: -1
        at java.util.ArrayList.elementData(ArrayList.java:422)
        at java.util.ArrayList.remove(ArrayList.java:499)
        at org.openlowcode.tools.richtext.RichTextArea.splitparagraphatcurrentchar(RichTextArea.java:440)
        at org.openlowcode.tools.richtext.Paragraph$13.handle(Paragraph.java:1037)
        at org.openlowcode.tools.richtext.Paragraph$13.handle(Paragraph.java:955)
        at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)

if this explosion is fixed, another explosion seems to be behind. 3 first lines are temporary logs added to RichTextArea after line 439 if activeparagraphindex = -1

SEVERE   11:22.736  ------------- Detected no active paragraph, does not manage split
SEVERE   11:22.739         >>> split current paragraph length/caret (6/3)
SEVERE   11:22.751         >>> split firstparagraph = 3, secondparagraph = 3
        at java.util.ArrayList.elementData(ArrayList.java:422)
        at java.util.ArrayList.get(ArrayList.java:435)
        at com.sun.javafx.collections.ObservableListWrapper.get(ObservableListWrapper.java:89)
        at com.sun.javafx.collections.VetoableListDecorator.get(VetoableListDecorator.java:306)
        at javafx.scene.Parent$2.onProposedChange(Parent.java:423)
        at com.sun.javafx.collections.VetoableListDecorator.remove(VetoableListDecorator.java:329)
        at org.openlowcode.tools.richtext.RichTextArea.redrawActiveParagraph(RichTextArea.java:905)
        at org.openlowcode.tools.richtext.Paragraph$13.handle(Paragraph.java:1038)
        at org.openlowcode.tools.richtext.Paragraph$13.handle(Paragraph.java:955)
        at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)