Bukkit Java NullPointer when checking if something is null -

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i using bukkit api 1.8.3

i have piece of code:

for(string vey : main.getconfig().getconfigurationsection("shopitems."+key+".enchantments").getkeys(false)) {     enchantment ench = enchantment.getbyname(vey);     int level = main.getconfig().getint("shopitems."+key+".enchantments."+vey);     meta.addenchant(ench, level, true); }

this piece of code gives me nullpointer pointing line starts for-loop iteration.

to try fix have null checker:

if(main.getconfig().getconfigurationsection("shopitems."+key+".enchantments").getkeys(false)!=null)

after null checker put code above inside if statement.

however getting nullpointer on line testing if path null

my question: why not working , how can fix it

note: main.getconfig() returns fileconfiguration not null have tested debugged this

if(main.getconfig().getconfigurationsection("shopitems."+key+".enchantments").getkeys(false)!=null)

is wrong, because when try getkeys(false) returns null because getconfigurationsection() null. can fix by: 

if(main.getconfig().getconfigurationsection("shopitems."+key+".enchantments") !=null);

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