Plugin Help Whitelist isnt acting as a whitelist

Code:

        if ((p.getLocation().getBlock() != null) &&
                (!this.plugin.blocks.containsValue(p.getLocation().getBlock().toString()))) {
            System.out.println("testing");
            if (this.plugin.checkpoint.containsKey(p)) {
                ArenaManager.teleportToStart(this.plugin, p, p.getWorld().getName());
            }
        }

The block map contain block types via config by CAPITAL name like GRASS STONE COBBLESTONE as im not sure how to covert using item id's in these checks specially cause i cant get this to work in the first place..

What it has to do is, Blocks will store blocks like this in its hashmap:

{world=[GRASS, STONE, COBBLESTONE]}

These blocks can be altered in config but these are the "allowed" blocks that you are allowed to step on, any other will cause a teleport. However at the very moment the section tends to teleport you regardless of any block whatsoever meaning wether its stone grass cobblestone or really anything aslong as u move even the slightest bit wether its moving via keyboard with wsad or mouse movement it pulls you back to the teleport section, anyone have a better solution to make the intended whitelist become an accuall whitelist.?

 

@Scorpionvssub And have you any idea at all what Block#toString() returns?