[1.7.x] Fixed #23674 -- Fixed a crash when a MultiValueField has invalid data.

Backport of 0dea81cd6d34b3e41cc4bbec99b5fdf06142b09e from master

1 files changed, 5 insertions, 1 deletions

diff --git a/django/forms/fields.py b/django/forms/fields.py
index f686b34a09..2823aaf53a 100644
--- a/django/forms/fields.py
+++ b/django/forms/fields.py
@@ -1068,7 +1068,11 @@ class MultiValueField(Field):
             if not isinstance(initial, list):
                 initial = self.widget.decompress(initial)
         for field, initial, data in zip(self.fields, initial, data):
-            if field._has_changed(field.to_python(initial), data):
+            try:
+                initial = field.to_python(initial)
+            except ValidationError:
+                return True
+            if field._has_changed(initial, data):
                 return True
         return False