diff --git a/copyparty/httpcli.py b/copyparty/httpcli.py
index a625c53a..90ec5fb7 100644
--- a/copyparty/httpcli.py
+++ b/copyparty/httpcli.py
@@ -496,7 +496,12 @@ class HttpCli(object):
                 self.log("clone {} done".format(cstart[0]))
 
         x = self.conn.hsrv.broker.put(True, "up2k.confirm_chunk", ptop, wark, chash)
-        num_left, path = x.get()
+        x = x.get()
+        try:
+            num_left, path = x
+        except:
+            self.loud_reply(x, status=500)
+            return False
 
         if not WINDOWS and num_left == 0:
             times = (int(time.time()), int(lastmod))
diff --git a/copyparty/up2k.py b/copyparty/up2k.py
index 75706188..1f09f240 100644
--- a/copyparty/up2k.py
+++ b/copyparty/up2k.py
@@ -421,7 +421,7 @@ class Up2k(object):
                 raise Pebkac(400, "unknown wark")
 
             if chash not in job["need"]:
-                raise Pebkac(200, "already got that but thanks??")
+                raise Pebkac(400, "already got that but thanks??")
 
             nchunk = [n for n, v in enumerate(job["hash"]) if v == chash]
             if not nchunk:
@@ -438,12 +438,19 @@ class Up2k(object):
 
     def confirm_chunk(self, ptop, wark, chash):
         with self.mutex:
-            job = self.registry[ptop][wark]
-            pdir = os.path.join(job["ptop"], job["prel"])
-            src = os.path.join(pdir, job["tnam"])
-            dst = os.path.join(pdir, job["name"])
+            try:
+                job = self.registry[ptop][wark]
+                pdir = os.path.join(job["ptop"], job["prel"])
+                src = os.path.join(pdir, job["tnam"])
+                dst = os.path.join(pdir, job["name"])
+            except Exception as ex:
+                return "confirm_chunk, wark, " + repr(ex)
+
+            try:
+                job["need"].remove(chash)
+            except Exception as ex:
+                return "confirm_chunk, chash, " + repr(ex)
 
-            job["need"].remove(chash)
             ret = len(job["need"])
             if ret > 0:
                 return ret, src