diff --git a/addons/survey/models/survey_question.py b/addons/survey/models/survey_question.py
index ff3204f7d45..9159871264d 100644
--- a/addons/survey/models/survey_question.py
+++ b/addons/survey/models/survey_question.py
@@ -393,6 +393,7 @@ class SurveyQuestion(models.Model):
             if question.question_type in ['simple_choice', 'multiple_choice', 'matrix']:
                 answer_lines = all_lines.filtered(
                     lambda line: line.answer_type == 'suggestion' or (
+                        line.skipped and not line.answer_type) or (
                         line.answer_type == 'char_box' and question.comment_count_as_answer)
                     )
                 comment_line_ids = all_lines.filtered(lambda line: line.answer_type == 'char_box')
diff --git a/addons/survey/models/survey_user_input.py b/addons/survey/models/survey_user_input.py
index 8f006543fec..e6aab8ba70a 100644
--- a/addons/survey/models/survey_user_input.py
+++ b/addons/survey/models/survey_user_input.py
@@ -274,6 +274,12 @@ class SurveyUserInput(models.Model):
     def _save_line_choice(self, question, old_answers, answers, comment):
         if not (isinstance(answers, list)):
             answers = [answers]
+
+        if not answers:
+            # add a False answer to force saving a skipped line
+            # this will make this question correctly considered as skipped in statistics
+            answers = [False]
+
         vals_list = []
 
         if question.question_type == 'simple_choice':
@@ -291,6 +297,11 @@ class SurveyUserInput(models.Model):
     def _save_line_matrix(self, question, old_answers, answers, comment):
         vals_list = []
 
+        if not answers and question.matrix_row_ids:
+            # add a False answer to force saving a skipped line
+            # this will make this question correctly considered as skipped in statistics
+            answers = {question.matrix_row_ids[0].id: [False]}
+
         if answers:
             for row_key, row_answer in answers.items():
                 for answer in row_answer:
diff --git a/addons/survey/tests/common.py b/addons/survey/tests/common.py
index b917606ad8a..1103b699422 100644
--- a/addons/survey/tests/common.py
+++ b/addons/survey/tests/common.py
@@ -147,7 +147,7 @@ class SurveyCase(common.TransactionCase):
         return self.env['survey.user_input.line'].create(base_alvals)
 
     # ------------------------------------------------------------
-    # UTILS
+    # UTILS / CONTROLLER ENDPOINTS FLOWS
     # ------------------------------------------------------------
 
     def _access_start(self, survey):
@@ -216,6 +216,36 @@ class SurveyCase(common.TransactionCase):
         post_data.update(**additional_post_data)
         return post_data
 
+    # ------------------------------------------------------------
+    # UTILS / TOOLS
+    # ------------------------------------------------------------
+
+    def _assert_skipped_question(self, question, survey_user):
+        statistics = question._prepare_statistics(survey_user.user_input_line_ids)
+        question_data = next(
+            (question_data
+            for question_data in statistics
+            if question_data.get('question') == question),
+            False
+        )
+        self.assertTrue(bool(question_data))
+        self.assertEqual(len(question_data.get('answer_input_skipped_ids')), 1)
+
+    def _create_one_question_per_type(self):
+        all_questions = self.env['survey.question']
+        for (question_type, dummy) in self.env['survey.question']._fields['question_type'].selection:
+            kwargs = {}
+            if question_type == 'multiple_choice':
+                kwargs['labels'] = [{'value': 'MChoice0'}, {'value': 'MChoice1'}]
+            elif question_type == 'simple_choice':
+                kwargs['labels'] = []
+            elif question_type == 'matrix':
+                kwargs['labels'] = [{'value': 'Column0'}, {'value': 'Column1'}]
+                kwargs['labels_2'] = [{'value': 'Row0'}, {'value': 'Row1'}]
+            all_questions |= self._add_question(self.page_0, 'Q0', question_type, **kwargs)
+
+        return all_questions
+
 
 class TestSurveyCommon(SurveyCase):
     def setUp(self):
diff --git a/addons/survey/tests/test_survey.py b/addons/survey/tests/test_survey.py
index f1c2dfc602c..dc6469b1f56 100644
--- a/addons/survey/tests/test_survey.py
+++ b/addons/survey/tests/test_survey.py
@@ -11,17 +11,7 @@ class TestSurveyInternals(common.TestSurveyCommon):
     @users('survey_manager')
     def test_answer_validation_mandatory(self):
         """ For each type of question check that mandatory questions correctly check for complete answers """
-        for (question_type, text) in self.env['survey.question']._fields['question_type'].selection:
-            kwargs = {}
-            if question_type == 'multiple_choice':
-                kwargs['labels'] = [{'value': 'MChoice0'}, {'value': 'MChoice1'}]
-            elif question_type == 'simple_choice':
-                kwargs['labels'] = []
-            elif question_type == 'matrix':
-                kwargs['labels'] = [{'value': 'Column0'}, {'value': 'Column1'}]
-                kwargs['labels_2'] = [{'value': 'Row0'}, {'value': 'Row1'}]
-            question = self._add_question(self.page_0, 'Q0', question_type, **kwargs)
-
+        for question in self._create_one_question_per_type():
             self.assertDictEqual(
                 question.validate_question(''),
                 {question.id: 'TestError'}
@@ -113,3 +103,19 @@ class TestSurveyInternals(common.TestSurveyCommon):
             question.validate_question('valid'),
             {}
         )
+
+    @users('survey_manager')
+    def test_skipped_values(self):
+        """ Create one question per type of questions.
+        Make sure they are correctly registered as 'skipped' after saving an empty answer for each
+        of them. """
+
+        questions = self._create_one_question_per_type()
+        survey_user = self.survey._create_answer(user=self.survey_user)
+
+        for question in questions:
+            answer = '' if question.question_type in ['char_box', 'text_box'] else None
+            survey_user.save_lines(question, answer)
+
+        for question in questions:
+            self._assert_skipped_question(question, survey_user)