diff --git a/music21/tree/verticality.py b/music21/tree/verticality.py
index 7df4646b3..1efb3b644 100644
--- a/music21/tree/verticality.py
+++ b/music21/tree/verticality.py
@@ -814,8 +814,11 @@ def conditionalAdd(ts, n: note.Note) -> None:
             from music21 import stream
 
             nonlocal pitchBust  # love Py3!!!
-            p = n.pitch
-            pitchKey = p.nameWithOctave
+            try:
+                p = n.pitch
+                pitchKey = p.nameWithOctave
+            except AttributeError:
+                return
 
             pitchGroup = None
             if addPartIdAsGroup: