diff --git a/app/views/tree/_submodule_item.html.haml b/app/views/tree/_submodule_item.html.haml
index 43fa7f2..b0562fe 100644
--- a/app/views/tree/_submodule_item.html.haml
+++ b/app/views/tree/_submodule_item.html.haml
@@ -1,4 +1,4 @@
-- url = submodule_item.url(@ref) rescue nil
+- url = submodule_item.url(@ref) rescue ''
 - name = submodule_item.basename
 - return unless url
 %tr{ class: "tree-item", url: url }
--
libgit2 0.21.2