diff --git a/osinaweb/osinacore/api/views.py b/osinaweb/osinacore/api/views.py
index 38f86c93..aaca4912 100644
--- a/osinaweb/osinacore/api/views.py
+++ b/osinaweb/osinacore/api/views.py
@@ -32,9 +32,21 @@ def authenticate_customer(request):
     if request.method == 'POST':
         email = request.POST.get('email')
         password = request.POST.get('password')
+        
+        # Check if user with provided email exists
+        try:
+            user = User.objects.get(email=email)
+        except User.DoesNotExist:
+            return JsonResponse({'success': False, 'error': 'User with this email does not exist'})
+        
+        # Perform authentication
         user = authenticate(request, email=email, password=password)
+        
+        # Check authentication result
         if user is not None:
+            # Authentication successful
             login(request, user)
             return JsonResponse({'success': True})
         else:
-            return JsonResponse({'success': False, 'error': 'Invalid credentials'})
\ No newline at end of file
+            # Authentication failed due to invalid password
+            return JsonResponse({'success': False, 'error': 'Invalid password'})
\ No newline at end of file