diff --git a/kallithea/alembic/versions/151b4a4e8c48_db_migration_step_after_93834966ae01_.py b/kallithea/alembic/versions/151b4a4e8c48_db_migration_step_after_93834966ae01_.py
new file mode 100644
--- /dev/null
+++ b/kallithea/alembic/versions/151b4a4e8c48_db_migration_step_after_93834966ae01_.py
@@ -0,0 +1,51 @@
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""db: migration step after 93834966ae01 dropped non-nullable inherit_default_permissions
+
+Revision ID: 151b4a4e8c48
+Revises: b74907136bc1
+Create Date: 2019-11-23 01:37:42.963119
+
+"""
+
+# The following opaque hexadecimal identifiers ("revisions") are used
+# by Alembic to track this migration script and its relations to others.
+revision = '151b4a4e8c48'
+down_revision = 'b74907136bc1'
+branch_labels = None
+depends_on = None
+
+import sqlalchemy as sa
+from alembic import op
+
+
+def upgrade():
+    meta = sa.MetaData()
+    meta.reflect(bind=op.get_bind())
+
+    if 'inherit_default_permissions' in meta.tables['users'].columns:
+        with op.batch_alter_table('users', schema=None) as batch_op:
+            batch_op.drop_column('inherit_default_permissions')
+
+    if 'users_group_inherit_default_permissions' in meta.tables['users_groups'].columns:
+        with op.batch_alter_table('users_groups', schema=None) as batch_op:
+            batch_op.drop_column('users_group_inherit_default_permissions')
+
+
+def downgrade():
+    with op.batch_alter_table('users_groups', schema=None) as batch_op:
+        batch_op.add_column(sa.Column('users_group_inherit_default_permissions', sa.BOOLEAN(), nullable=False, default=True))
+
+    with op.batch_alter_table('users', schema=None) as batch_op:
+        batch_op.add_column(sa.Column('inherit_default_permissions', sa.BOOLEAN(), nullable=False, default=True))