diff --git a/wal/trace/vcd.py b/wal/trace/vcd.py
index 63c7861..b6089ec 100644
--- a/wal/trace/vcd.py
+++ b/wal/trace/vcd.py
@@ -39,7 +39,7 @@ def __init__(self, filename, tid, container, from_string=False, keep_signals=Non
         self.signals = set(Trace.SPECIAL_SIGNALS + self.rawsignals)
 
         self.id2name = {v: k for k, v in self.name2id.items()}
-        self.rawsignals_by_handle = [self.id2name[s] for s in self.all_ids]
+        self.rawsignals_by_handle = [self.id2name[s] for s in self.all_ids if s in self.id2name]
         self.signals_by_handle = set(self.rawsignals_by_handle)
 
     def parse(self, vcddata):