--- a/core/modules/views/views.theme.inc
+++ b/core/modules/views/views.theme.inc
@@ -639,7 +639,7 @@
         }
 
         // Only bother with separators and stuff if the field shows up.
-        if (!empty($field_output) && empty($column_reference['content'])) {
+        if ((string) $field_output !== '' && empty($column_reference['content'])) {
           // Place the field into the column, along with an optional separator.
           if (!empty($column_reference['content'])) {
             if (!empty($options['info'][$column]['separator'])) {