Fixed #23920 -- Fixed MySQL crash when adding blank=True to TextField.

Thanks wkornewald for the report and Markus Holtermann for review.

1 files changed, 1 insertions, 1 deletions

diff --git a/django/db/backends/schema.py b/django/db/backends/schema.py
index 594a360c97..1b4fdbcd4d 100644
--- a/django/db/backends/schema.py
+++ b/django/db/backends/schema.py
@@ -552,7 +552,7 @@ class BaseDatabaseSchemaEditor(object):
         # Default change?
         old_default = self.effective_default(old_field)
         new_default = self.effective_default(new_field)
-        if old_default != new_default:
+        if old_default != new_default and not self.skip_default(new_field):
             if new_default is None:
                 actions.append((
                     self.sql_alter_column_no_default % {