diff --git a/odoo/addons/base/models/ir_attachment.py b/odoo/addons/base/models/ir_attachment.py
index 915d27bdf13..dda02d44171 100644
--- a/odoo/addons/base/models/ir_attachment.py
+++ b/odoo/addons/base/models/ir_attachment.py
@@ -326,7 +326,7 @@ class IrAttachment(models.Model):
         supported_subtype = ICP('base.image_autoresize_extensions', 'png,jpeg,bmp,tiff').split(',')
 
         mimetype = values['mimetype'] = self._compute_mimetype(values)
-        _type, _, _subtype = mimetype.partition('/')
+        _type, _match, _subtype = mimetype.partition('/')
         is_image_resizable = _type == 'image' and _subtype in supported_subtype
         if is_image_resizable and (values.get('datas') or values.get('raw')):
             is_raw = values.get('raw')
@@ -341,6 +341,10 @@ class IrAttachment(models.Model):
                     else:  # datas
                         img = ImageProcess(base64.b64decode(values['datas']), verify_resolution=False)
 
+                    if not img.image:
+                        _logger.info('Post processing ignored : Empty source, SVG, or WEBP')
+                        return values
+
                     w, h = img.image.size
                     nw, nh = map(int, max_resolution.split('x'))
                     if w > nw or h > nh:
diff --git a/odoo/addons/base/tests/test_ir_attachment.py b/odoo/addons/base/tests/test_ir_attachment.py
index 40178ab4c33..377cc84f19c 100644
--- a/odoo/addons/base/tests/test_ir_attachment.py
+++ b/odoo/addons/base/tests/test_ir_attachment.py
@@ -260,6 +260,13 @@ class TestIrAttachment(TransactionCaseWithUserDemo):
         self.Attachment._gc_file_store_unsafe()
         self.assertFalse(os.path.isfile(store_path), 'file removed')
 
+    def test_14_invalid_mimetype_with_correct_file_extension_no_post_processing(self):
+        # test with fake svg with png mimetype
+        unique_blob = b'<svg xmlns="http://www.w3.org/2000/svg"></svg>'
+        a1 = self.Attachment.create({'name': 'a1', 'raw': unique_blob, 'mimetype': 'image/png'})
+        self.assertEqual(a1.raw, unique_blob)
+        self.assertEqual(a1.mimetype, 'image/png')
+
 
 class TestPermissions(TransactionCaseWithUserDemo):
     def setUp(self):