Ah, before i forget, if you’re using a TextureRect in your scene that makes the crash happens, pay attention to that:
If that’s the case, this bug is already known and the workaround is not use the modes cited in the image.
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That was it! That was the problem which I imagine was fired when the size changed for different sized label causing the texture to resize causing the label to resize etc.
Thank you again. I have spent the day rebuilding the upgrade cards now in a different way. They are actually much better this time around so it all ended well I suppose 
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