diff --git a/apps/files/fixtures/files/theme-invalid-app.jar b/apps/files/fixtures/files/theme-invalid-app.jar
new file mode 100644
index 0000000000..3f55306504
Binary files /dev/null and b/apps/files/fixtures/files/theme-invalid-app.jar differ
diff --git a/apps/files/tests.py b/apps/files/tests.py
index 40d3315d45..dcd545c584 100644
--- a/apps/files/tests.py
+++ b/apps/files/tests.py
@@ -125,8 +125,8 @@ class TestParseXpi(test_utils.TestCase):
         for version in ('3.0', '3.6.*'):
             AppVersion.objects.create(application_id=1, version=version)
 
-    def parse(self, addon=None):
-        path = 'apps/files/fixtures/files/extension.xpi'
+    def parse(self, addon=None, filename='extension.xpi'):
+        path = 'apps/files/fixtures/files/' + filename
         xpi = os.path.join(settings.ROOT, path)
         return parse_xpi(xpi, addon)
 
@@ -180,6 +180,10 @@ class TestParseXpi(test_utils.TestCase):
         eq_(e.exception.messages,
             ["<em:type> doesn't match add-on"])
 
+    def test_unknown_app(self):
+        data = self.parse(filename='theme-invalid-app.jar')
+        eq_(data['apps'], [])
+
     # parse_dictionary
     # parse_theme
     # parse_langpack
diff --git a/apps/files/utils.py b/apps/files/utils.py
index dda3645d4f..36339aee6c 100644
--- a/apps/files/utils.py
+++ b/apps/files/utils.py
@@ -84,6 +84,8 @@ def parse_xpi(xpi, addon=None):
     App = collections.namedtuple('App', 'appdata id min max')
     for node in rdf.getElementsByTagName('em:targetApplication'):
         app = amo.APP_GUIDS.get(get_text_value(node, 'id'))
+        if not app:
+            continue
         min_val = get_text_value(node, 'minVersion')
         max_val = get_text_value(node, 'maxVersion')