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-rw-r--r--archaeological_context_records/forms.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/archaeological_context_records/forms.py b/archaeological_context_records/forms.py
index 95787294f..0c458498f 100644
--- a/archaeological_context_records/forms.py
+++ b/archaeological_context_records/forms.py
@@ -121,6 +121,8 @@ class PeriodSelect(forms.Form):
fields[key] = self.fields[key]
if key == insert_period_after:
for period_key in self.PERIOD_FIELDS:
+ if period_key not in fields:
+ continue
fields[period_key] = self.fields[period_key]
if period_key in self.fields:
fields[period_key] = self.fields[period_key]