diff --git a/libs/libunitscan.lua b/libs/libunitscan.lua
index 907c1991..d878a1af 100644
--- a/libs/libunitscan.lua
+++ b/libs/libunitscan.lua
@@ -45,7 +45,7 @@ function GetUnitData(name, active)
 end
 
 local function AddData(db, name, class, level, elite)
-  if not name then return end
+  if not name or not db then return end
   units[db][name] = units[db][name] or {}
   units[db][name].class = class or units[db][name].class
   units[db][name].level = level or units[db][name].level