diff --git a/src/server.py b/src/server.py
--- a/src/server.py
+++ b/src/server.py
@@ -107,7 +107,7 @@ class Server:
 			self.dataFile.close()
 		if self._treeFile:
 			log.info("updating hash tree...")
-			for (k,v) in self._newLeaves:
+			for (k,v) in self._newLeaves.values():
 				self.tree.updateLeaf(k,v)
 			self.tree.save(self._treeFile)
 		log.info("done")