diff --git a/wally/suits/io/results_loader.py b/wally/suits/io/results_loader.py
index 3c8d9c5..c67dbe8 100644
--- a/wally/suits/io/results_loader.py
+++ b/wally/suits/io/results_loader.py
@@ -16,7 +16,7 @@
     data = {}
 
     for tp, pre_result in test_output:
-        if tp != 'io':
+        if tp != 'io' or pre_result is None:
             pass
 
         for name, results in pre_result['res'].items():