diff --git a/execution.py b/execution.py
index e10fdbb6..5f5d6c73 100644
--- a/execution.py
+++ b/execution.py
@@ -21,7 +21,8 @@ def get_input_data(inputs, class_def, unique_id, outputs={}, prompt={}, extra_da
             input_unique_id = input_data[0]
             output_index = input_data[1]
             if input_unique_id not in outputs:
-                return None
+                input_data_all[x] = (None,)
+                continue
             obj = outputs[input_unique_id][output_index]
             input_data_all[x] = obj
         else: