diff --git a/smash/web/importer/importer.py b/smash/web/importer/importer.py
index bdab56472685f5e07197f81c89df20201e99ab3a..2639f670e2695bda2f4e1f2dd1d981d4e1fe5164 100644
--- a/smash/web/importer/importer.py
+++ b/smash/web/importer/importer.py
@@ -15,23 +15,28 @@ class Importer(object):
         # type: (str, SubjectImportReader) -> None
         self.filename = filename
         self.reader = reader
-        self.added_count = 0;
+        self.added_count = 0
+        self.problematic_count = 0
 
     def execute(self):
-        self.added_count = 0;
+        self.added_count = 0
+        self.problematic_count = 0
         study_subjects = self.reader.load_data(self.filename)
 
         for study_subject in study_subjects:
             try:
                 if study_subject.study is None:
+                    self.problematic_count += 1
                     logger.warn("Empty study found. Ignoring")
                     continue
                 elif study_subject.study.id != GLOBAL_STUDY_ID:
+                    self.problematic_count += 1
                     logger.warn("Empty study found. Ignoring: " + study_subject.study.id)
                     continue
                 else:
                     self.import_study_subject(study_subject)
             except:
+                self.problematic_count += 1
                 traceback.print_exc(file=sys.stdout)
                 logger.error("Problem with importing study subject: " + study_subject.screening_number)
 
diff --git a/smash/web/tests/importer/test_importer.py b/smash/web/tests/importer/test_importer.py
index 5eb6ba5997e8ee354cb4ca82e8e68f4dedf29b9b..320e6bf791d82ff29aef8937e14acc887a2a4184 100644
--- a/smash/web/tests/importer/test_importer.py
+++ b/smash/web/tests/importer/test_importer.py
@@ -37,3 +37,35 @@ class TestImporter(TestCase):
         self.assertEqual(study_subject_counter + 1, StudySubject.objects.count())
 
         self.assertEqual(1, importer.added_count)
+        self.assertEqual(0, importer.problematic_count)
+
+    def test_import_invalid(self):
+        study_subjects = []
+        study_subject = StudySubject()
+        study_subject.screening_number = "Cov-123456"
+        study_subject.study = self.study
+        study_subjects.append(study_subject)
+
+        importer = Importer(filename="empty.csv", reader=MockReader(study_subjects))
+        study_subject_counter = StudySubject.objects.count()
+        importer.execute()
+
+        self.assertEqual(study_subject_counter, StudySubject.objects.count())
+
+        self.assertEqual(0, importer.added_count)
+        self.assertEqual(1, importer.problematic_count)
+
+    def test_import_no_study(self):
+        study_subjects = []
+        study_subject = StudySubject()
+        study_subject.screening_number = "Cov-123456"
+        study_subjects.append(study_subject)
+
+        importer = Importer(filename="empty.csv", reader=MockReader(study_subjects))
+        study_subject_counter = StudySubject.objects.count()
+        importer.execute()
+
+        self.assertEqual(study_subject_counter, StudySubject.objects.count())
+
+        self.assertEqual(0, importer.added_count)
+        self.assertEqual(1, importer.problematic_count)