diff --git a/tests/conftest.py b/tests/conftest.py
index 925acc3..9dc9302 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -137,6 +137,7 @@ for i in range(50):
         formdata.data['4'] = 'open_two'
         formdata.data['4_display'] = 'open_two'
         formdata.data['10'] = 'b'
+        formdata.data['8'] = str(i)
     else:
         formdata.data['2'] = 'baz'
         formdata.data['2_display'] = 'baz'
@@ -144,9 +145,9 @@ for i in range(50):
         formdata.data['4_display'] = "open'three"
         formdata.data['9'] = 'a'
         formdata.data['10'] = 'b'
+        formdata.data['8'] = ''
 
     formdata.data['3'] = bool(i % 2)
-    formdata.data['8'] = str(i % 10)
     if i%3 == 0:
         formdata.jump_status('new')
     else:
diff --git a/wcs_olap/feeder.py b/wcs_olap/feeder.py
index 8017309..f596f20 100644
--- a/wcs_olap/feeder.py
+++ b/wcs_olap/feeder.py
@@ -846,7 +846,7 @@ class WcsFormdefFeeder(object):
                         v = None
                 elif field.type == 'string':
                     if has_digits_validation(field):
-                        if raw is not None:
+                        if raw is not None and raw.isnumeric():
                             v = int(raw)
                     else:
                         v = raw