When I close a custom GuiScreen by calling 

Minecraft.getMinecraft().displayGuiScreen(null);

after I clicked on a custom button that executes that code, it appears that the field 

GuiScreen#eventButton

still contains a value of a mouse button press, because I pressed a button to close my GuiScreen.

Now, when I reopen the custom GuiScreen the method

GuiScreen#mouseClickMove(int mouseX, int mouseY, int clickedMouseButton, long timeSinceLastClick)

is being called continously util I reset it by pressing and releasing a mouse button.

 

How can I reset the field eventButton when closing my GuiScreen to make sure this issue does not arise again?

I didn't think the solution would be that easy, thanks!!