diff --git a/addons/base_import/i18n/base_import.pot b/addons/base_import/i18n/base_import.pot
index 38c450f9f48..8bd249014bc 100644
--- a/addons/base_import/i18n/base_import.pot
+++ b/addons/base_import/i18n/base_import.pot
@@ -255,6 +255,16 @@ msgstr ""
 msgid "Error at row %s: \"%s\""
 msgstr ""
 
+#. module: base_import
+#. odoo-python
+#: code:addons/base_import/models/base_import.py:0
+#, python-format
+msgid ""
+"Error while importing records: all rows should be of the same size, but the "
+"title row has %d entries while the first row has %d. You may need to change "
+"the separator character."
+msgstr ""
+
 #. module: base_import
 #. odoo-javascript
 #: code:addons/base_import/static/src/import_data_progress/import_data_progress.xml:0
diff --git a/addons/base_import/models/base_import.py b/addons/base_import/models/base_import.py
index 660b11da9a3..5f0bd1af8a1 100644
--- a/addons/base_import/models/base_import.py
+++ b/addons/base_import/models/base_import.py
@@ -1040,6 +1040,10 @@ class Import(models.TransientModel):
         import_fields = [f for f in fields if f]
 
         _file_length, rows_to_import = self._read_file(options)
+        if len(rows_to_import[0]) != len(fields):
+            raise ImportValidationError(
+                _("Error while importing records: all rows should be of the same size, but the title row has %d entries while the first row has %d. You may need to change the separator character.", len(fields), len(rows_to_import[0]))
+            )
 
         if options.get('has_headers'):
             rows_to_import = rows_to_import[1:]