Not an expert, but I would venture to guess that it is now more viscous.......if the lid was on but not screwed tight, you should be OK, but not if left wide open.
Having tipped my little jar over and spilling it out twice...sob... I poured what was left into an empty eye dropper bottle. I just ran out after my last RR race. I must have wasted 80% of it to spillage before coming up with the eye dropper idea. A little less precise, but way less accident prone.