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-rw-r--r--archaeological_warehouse/models.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/archaeological_warehouse/models.py b/archaeological_warehouse/models.py
index 34ccba88d..659688a2b 100644
--- a/archaeological_warehouse/models.py
+++ b/archaeological_warehouse/models.py
@@ -86,6 +86,7 @@ class Warehouse(Address, DashboardFormItem, OwnPerms,
blank=True)
main_image = models.ForeignKey(
Document, related_name='main_image_warehouses',
+ on_delete=models.SET_NULL,
verbose_name=_(u"Main image"), blank=True, null=True)
external_id = models.TextField(_(u"External ID"), blank=True, null=True)
auto_external_id = models.BooleanField(