diff --git a/mclevel.py b/mclevel.py
index 8077820..a2afb9c 100644
--- a/mclevel.py
+++ b/mclevel.py
@@ -1154,6 +1154,7 @@ class MCLevel(object):
         if not hasattr(self, "TileEntities"): return;
         newEnts = [];
         for ent in self.TileEntities:
+            if not "x" in ent: continue
             if map(lambda x:x.value, (ent[a] for a in "xyz")) in box: 
                 continue;
             newEnts.append(ent);