diff --git a/netrender/operators.py b/netrender/operators.py
index c6ff0917ab6a2567d3abf7c1a3fd31fe476d79ca..a3a5ef7d35c3e9eb8dfc369a3ceca39fe599fd5f 100644
--- a/netrender/operators.py
+++ b/netrender/operators.py
@@ -418,7 +418,8 @@ class netclientdownload(bpy.types.Operator):
                     nb_missing += 1
             
             if not finished_frames:
-                return
+                self.report({'ERROR'}, "Job doesn't have any finished frames")
+                return {'ERROR'}
             
             frame_ranges = []