diff --git a/apps/addons/tests/test_views.py b/apps/addons/tests/test_views.py
index c96559359e..2508901a8e 100644
--- a/apps/addons/tests/test_views.py
+++ b/apps/addons/tests/test_views.py
@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+from cStringIO import StringIO
 from datetime import datetime
 from decimal import Decimal
 import json
@@ -22,6 +23,7 @@ from amo.urlresolvers import reverse
 from amo.tests.test_helpers import AbuseBase, AbuseDisabledBase
 from addons.models import Addon, AddonUser, Charity
 from files.models import File
+from paypal.tests import other_error
 from stats.models import Contribution
 from translations.helpers import truncate
 from translations.query import order_by_translation
@@ -235,6 +237,13 @@ class TestContributeEmbedded(test_utils.TestCase):
                         'result_type=json'))
         assert not json.loads(res.content)['paykey']
 
+    @patch('urllib2.OpenerDirector.open')
+    def test_paypal_other_error_json(self, opener, **kwargs):
+        opener.return_value = StringIO(other_error)
+        res = self.client.get('%s?%s' % (
+                        reverse('addons.contribute', args=[self.addon.slug]),
+                        'result_type=json'))
+        assert not json.loads(res.content)['paykey']
 
 class TestContribute(test_utils.TestCase):
     fixtures = ['base/apps', 'base/addon_3615', 'base/addon_592']
diff --git a/apps/addons/views.py b/apps/addons/views.py
index de5fbe23d2..768fed3911 100644
--- a/apps/addons/views.py
+++ b/apps/addons/views.py
@@ -518,15 +518,14 @@ def embedded_contribute(request, addon):
                            paykey=paykey)
         contrib.save()
 
+    assert settings.PAYPAL_FLOW_URL, 'settings.PAYPAL_FLOW_URL is not defined'
+
     url = '%s?paykey=%s' % (settings.PAYPAL_FLOW_URL, paykey)
     if request.GET.get('result_type') == 'json' or request.is_ajax():
         # If there was an error getting the paykey, then JSON will
         # not have a paykey and the JS can cope appropriately.
         return http.HttpResponse(json.dumps({'url': url, 'paykey': paykey}),
                                  content_type='application/json')
-    elif paykey is None:
-        # If there was an error getting the paykey, raise this.
-        raise
     return http.HttpResponseRedirect(url)
 
 
diff --git a/apps/paypal/tests.py b/apps/paypal/tests.py
index e77d440e3f..48c35e927e 100644
--- a/apps/paypal/tests.py
+++ b/apps/paypal/tests.py
@@ -21,6 +21,8 @@ auth_error = ('error(0).errorId=520003'
             '&error(0).message=Authentication+failed.+API+'
             'credentials+are+incorrect.')
 
+other_error = ('error(0).errorId=520001'
+            '&error(0).message=Foo')
 
 class TestPayPal(test_utils.TestCase):
     def setUp(self):
@@ -41,6 +43,11 @@ class TestPayPal(test_utils.TestCase):
         opener.return_value = StringIO(good_response)
         eq_(paypal.get_paykey(self.data), 'AP-9GD76073HJ780401K')
 
+    @mock.patch('urllib2.OpenerDirector.open')
+    def test_other_fails(self, opener):
+        opener.return_value = StringIO(other_error)
+        self.assertRaises(paypal.PaypalError, paypal.get_paykey, self.data)
+
     def _test_no_mock(self):
         # Remove _ and run if you'd like to try unmocked.
         return paypal.get_paykey(self.data)