diff --git a/Categories/Cast.lua b/Categories/Cast.lua
index f16f1ad..f345b03 100644
--- a/Categories/Cast.lua
+++ b/Categories/Cast.lua
@@ -20,7 +20,7 @@ local UnitGUID = UnitGUID
 local IsNormalUnit = DogTag.IsNormalUnit
 
 local wow_ver = select(4, GetBuildInfo())
-local wow_classic = WOW_PROJECT_ID == WOW_PROJECT_CLASSIC
+local wow_classic = WOW_PROJECT_ID and WOW_PROJECT_ID == WOW_PROJECT_CLASSIC
 local wow_800 = wow_ver >= 80000
 
 local playerGuid = nil
diff --git a/Categories/Characteristics.lua b/Categories/Characteristics.lua
index b78d2a6..298a320 100644
--- a/Categories/Characteristics.lua
+++ b/Categories/Characteristics.lua
@@ -21,7 +21,7 @@ local L = DogTag_Unit.L
 local wow_320 = select(4, GetBuildInfo()) >= 30200
 local wow_700 = select(4, GetBuildInfo()) >= 70000
 local wow_800 = select(4, GetBuildInfo()) >= 80000
-local wow_classic = WOW_PROJECT_ID == WOW_PROJECT_CLASSIC
+local wow_classic = WOW_PROJECT_ID and WOW_PROJECT_ID == WOW_PROJECT_CLASSIC
 local GetQuestDifficultyColor
 if not wow_320 and not wow_classic then
 	GetQuestDifficultyColor = _G.GetDifficultyColor
diff --git a/Categories/Status.lua b/Categories/Status.lua
index 8e7b0c1..163248d 100644
--- a/Categories/Status.lua
+++ b/Categories/Status.lua
@@ -26,7 +26,7 @@ local deadTimes = {}
 
 -- Parnic: support for cataclysm; Divine Intervention was removed
 local wow_ver = select(4, GetBuildInfo())
-local wow_classic = WOW_PROJECT_ID == WOW_PROJECT_CLASSIC
+local wow_classic = WOW_PROJECT_ID and WOW_PROJECT_ID == WOW_PROJECT_CLASSIC
 local wow_400 = wow_ver >= 40000
 local wow_500 = wow_ver >= 50000
 local wow_600 = wow_ver >= 60000