diff --git a/src/enums.h b/src/enums.h
index a86127f..07a292c 100644
--- a/src/enums.h
+++ b/src/enums.h
@@ -150,6 +150,8 @@ enum SpellGroup_t : uint8_t {
 	SPELLGROUP_HEALING = 2,
 	SPELLGROUP_SUPPORT = 3,
 	SPELLGROUP_SPECIAL = 4,
+
+	SPELLGROUP_UNKNOWN = 255, // last, unspecified
 };
 
 enum SpellType_t : uint8_t {
diff --git a/src/luascript.cpp b/src/luascript.cpp
index 1f1e945..7148cf8 100644
--- a/src/luascript.cpp
+++ b/src/luascript.cpp
@@ -16671,7 +16671,7 @@ int LuaScriptInterface::luaSpellGroup(lua_State* L)
 				pushBoolean(L, true);
 			} else if (isString(L, 2)) {
 				group = stringToSpellGroup(getString(L, 2));
-				if (group != SPELLGROUP_NONE) {
+				if (group != SPELLGROUP_UNKNOWN) {
 					spell->setGroup(group);
 				} else {
 					std::cout << "[Warning - Spell::group] Unknown group: " << getString(L, 2) << std::endl;
@@ -16693,7 +16693,7 @@ int LuaScriptInterface::luaSpellGroup(lua_State* L)
 				pushBoolean(L, true);
 			} else if (isString(L, 2) && isString(L, 3)) {
 				primaryGroup = stringToSpellGroup(getString(L, 2));
-				if (primaryGroup != SPELLGROUP_NONE) {
+				if (primaryGroup != SPELLGROUP_UNKNOWN) {
 					spell->setGroup(primaryGroup);
 				} else {
 					std::cout << "[Warning - Spell::group] Unknown primaryGroup: " << getString(L, 2) << std::endl;
@@ -16701,7 +16701,7 @@ int LuaScriptInterface::luaSpellGroup(lua_State* L)
 					return 1;
 				}
 				secondaryGroup = stringToSpellGroup(getString(L, 3));
-				if (secondaryGroup != SPELLGROUP_NONE) {
+				if (secondaryGroup != SPELLGROUP_UNKNOWN) {
 					spell->setSecondaryGroup(secondaryGroup);
 				} else {
 					std::cout << "[Warning - Spell::group] Unknown secondaryGroup: " << getString(L, 3) << std::endl;
diff --git a/src/spells.cpp b/src/spells.cpp
index 39fe57d..8878d96 100644
--- a/src/spells.cpp
+++ b/src/spells.cpp
@@ -416,6 +416,7 @@ bool Spell::configureSpell(const pugi::xml_node& node)
 		std::string tmpStr = asLowerCaseString(attr.as_string());
 		if (tmpStr == "none" || tmpStr == "0") {
 			group = SPELLGROUP_NONE;
+			groupCooldown = 0;
 		} else if (tmpStr == "attack" || tmpStr == "1") {
 			group = SPELLGROUP_ATTACK;
 		} else if (tmpStr == "healing" || tmpStr == "2") {
diff --git a/src/spells.h b/src/spells.h
index dc38d5f..a210bb7 100644
--- a/src/spells.h
+++ b/src/spells.h
@@ -188,6 +188,9 @@ class Spell : public BaseSpell
 		}
 		void setGroup(SpellGroup_t g) {
 			group = g;
+			if(group == SPELLGROUP_NONE) {
+				groupCooldown = 0;
+			}
 		}
 		SpellGroup_t getSecondaryGroup() const {
 			return secondaryGroup;
diff --git a/src/tools.cpp b/src/tools.cpp
index 90b1413..2e71e2c 100644
--- a/src/tools.cpp
+++ b/src/tools.cpp
@@ -1243,8 +1243,10 @@ int64_t OTSYS_TIME()
 
 SpellGroup_t stringToSpellGroup(const std::string& value)
 {
-	std::string tmpStr = asLowerCaseString(value);
-	if (tmpStr == "attack" || tmpStr == "1") {
+	std::string tmpStr = boost::algorithm::to_lower_copy(value);
+	if (tmpStr == "none" || tmpStr == "0") {
+		return SPELLGROUP_NONE;
+	} else if (tmpStr == "attack" || tmpStr == "1") {
 		return SPELLGROUP_ATTACK;
 	} else if (tmpStr == "healing" || tmpStr == "2") {
 		return SPELLGROUP_HEALING;
@@ -1254,7 +1256,7 @@ SpellGroup_t stringToSpellGroup(const std::string& value)
 		return SPELLGROUP_SPECIAL;
 	}
 
-	return SPELLGROUP_NONE;
+	return SPELLGROUP_UNKNOWN;
 }
 
 std::vector<uint16_t> depotBoxes = {