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-rw-r--r--archaeological_finds/models_treatments.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/archaeological_finds/models_treatments.py b/archaeological_finds/models_treatments.py
index 996e03370..120dfe6f2 100644
--- a/archaeological_finds/models_treatments.py
+++ b/archaeological_finds/models_treatments.py
@@ -343,7 +343,7 @@ class Treatment(DashboardFormItem, ValueGetter, DocumentItem,
"""
m2m = {}
base_fields = [f.name for f in Find._meta.get_fields()]
- for k in resulting_find.keys():
+ for k in list(resulting_find.keys()):
# if not in base fields should be a m2m
if k not in base_fields:
values = resulting_find.pop(k)