diff --git a/lib/core/dump.py b/lib/core/dump.py
index 633541911..760b13949 100644
--- a/lib/core/dump.py
+++ b/lib/core/dump.py
@@ -183,6 +183,8 @@ class Dump:
                 maxlength1 = 0
                 maxlength2 = 0
 
+                colType = None
+
                 colList = columns.keys()
                 colList.sort(key=lambda x: x.lower())