diff --git a/lib/techniques/error/use.py b/lib/techniques/error/use.py
index b5a0c8570..3819fd69b 100644
--- a/lib/techniques/error/use.py
+++ b/lib/techniques/error/use.py
@@ -196,7 +196,7 @@ def errorUse(expression, expected=None, dump=False):
     startLimit = 0
     stopLimit = None
     output = None
-    outputs = []
+    outputs = None
     untilLimitChar = None
 
     _, _, _, _, _, expressionFieldsList, expressionFields, _ = agent.getFields(expression)
diff --git a/lib/techniques/union/use.py b/lib/techniques/union/use.py
index 1e0def827..486d1c480 100644
--- a/lib/techniques/union/use.py
+++ b/lib/techniques/union/use.py
@@ -143,7 +143,7 @@ def unionUse(expression, unpack=True, dump=False):
     origExpr = expression
     startLimit = 0
     stopLimit = None
-    value = ""
+    value = None
 
     width = getConsoleWidth()
     start = time.time()