diff --git a/LowHealth.lua b/LowHealth.lua
index abe4f3b..2464103 100644
--- a/LowHealth.lua
+++ b/LowHealth.lua
@@ -64,6 +64,11 @@ end
 
 function LifeSafer_LowHealth_ApplySettings()
 
+  -- restore defaults if saved variables are missing
+  if (not LifeSafer_LowHealth_Thresholds) then
+    LifeSafer_LowHealth_Thresholds = LifeSafer_LowHealth_Default_Thresholds
+  end
+
   -- for compatibility with older versions of saved variables
   if (not LifeSafer_LowHealth_Thresholds["SOUND"]) then
     LifeSafer_LowHealth_Thresholds["SOUND"] = { [1] = 30 }
@@ -78,9 +83,11 @@ function LifeSafer_LowHealth_ApplySettings()
   if (LifeSafer_LowHealth_Enabled) then
     LifeSafer_LowHealth_HealthFrame = LifeSafer_LowHealth_UseAltTextures and LowHealthWarningFrameAltTexture1 or LowHealthFrame
     frame:RegisterEvent("UNIT_DISPLAYPOWER")
+
     if (LifeSafer_LowHealth_HealthEnabled or LifeSafer_LowHealth_SoundEnabled) then
       frame:RegisterEvent("UNIT_HEALTH")
     end
+
     LifeSafer_LowHealth_ManaCheck()
     LifeSafer_LowHealth_ManaFrame = LifeSafer_LowHealth_UseAltTextures and LowHealthWarningFrameAltTexture2 or OutOfControlFrame
   else
@@ -101,6 +108,7 @@ function LifeSafer_LowHealth_FlashFrame(value, regular, critical, frame, state)
     if (UIFrameIsFlashing(frame) or UIFrameIsFading(frame)) then
       LifeSafer_LowHealth_FlashFrameStop(frame, state)
     end
+
   -- regular flash
   elseif (value > critical) then
     if (not (LowHealthWarningFrame.states[state] == REGULAR_FLASH)) then
@@ -114,11 +122,13 @@ function LifeSafer_LowHealth_FlashFrame(value, regular, critical, frame, state)
       end
       LowHealthWarningFrame.states[state] = REGULAR_FLASH
     end
+
   -- critical flash
   else
     if (not (LowHealthWarningFrame.states[state] == CRITICAL_FLASH)) then
       if (LifeSafer_LowHealth_HealthEmote and state == "UNIT_HEALTH") then DoEmote("healme") end
       if (LifeSafer_LowHealth_ManaEmote and state == "UNIT_MANA") then DoEmote("oom") end
+
       if (UIFrameIsFlashing(frame)) then
         --frame.flashDuration = frame.flashDuration + 10
         frame.fadeInTime = 0.2
@@ -127,23 +137,28 @@ function LifeSafer_LowHealth_FlashFrame(value, regular, critical, frame, state)
       else
         UIFrameFlash(frame, 0.2, 0.8, -1, nil, 0, 0)
       end
+
       LowHealthWarningFrame.states[state] = CRITICAL_FLASH
     end
   end
 
 end
 
+
 function LifeSafer_LowHealth_SmoothFlashFrame(value, threshold, frame, state)
 
   -- disable
   if (value > threshold or LifeSafer_LowHealth_CombatCheck(state) or UnitIsDeadOrGhost("player")) then
     LifeSafer_LowHealth_FlashFrameStop(frame, state)
+
   -- smooth flash
   else
     local rate = LifeSafer_LowHealth_GetHeartRate(state)
     local flashIn, flashOut = rate * 0.1, rate * 0.4
+
     if (UIFrameIsFlashing(frame)) then
       frame.flashDuration = frame.flashDuration + rate + 1
+
       if (rate < 1) then
         frame.fadeInTime = rate * 0.15
         frame.fadeOutTime = rate * 0.85
@@ -173,7 +188,7 @@ end
 
 function LifeSafer_LowHealth_OnEvent()
 
-  if (event == "UNIT_DISPLAYPOWER") then 
+  if (event == "UNIT_DISPLAYPOWER") then
     LifeSafer_LowHealth_ManaCheck()
     return
   end
@@ -185,9 +200,11 @@ function LifeSafer_LowHealth_OnEvent()
   if (event == "UNIT_HEALTH") then
     value = UnitHealth("player") / UnitHealthMax("player")
     LifeSafer_LowHealth_SoundCheck(this, value * 100, unpack(LifeSafer_LowHealth_Thresholds["SOUND"]))
+
     if (not LifeSafer_LowHealth_HealthEnabled) then
       return -- this hack is because both sound and health flash need this event
     end
+
     frame = LifeSafer_LowHealth_HealthFrame
     smooth = LifeSafer_LowHealth_HealthSync
   elseif (event == "UNIT_MANA") then
@@ -208,6 +225,7 @@ end
 function LifeSafer_LowHealth_CombatCheck(state)
 
   local combat = UnitAffectingCombat("player")
+
   if (not state or state == "UNIT_HEALTH") then
     return LifeSafer_LowHealth_HealthCombatOnly and not combat
   elseif (state == "UNIT_MANA") then
@@ -227,18 +245,21 @@ function LifeSafer_LowHealth_SoundCheck(frame, value, threshold)
       frame:SetScript("OnUpdate", nil)
       frame.heartRate = nil
     end
+
   -- regular
   elseif (not frame.heartRate) then
     frame:SetScript("OnUpdate", LifeSafer_LowHealth_OnUpdate)
     frame.timer = 1
     frame.heartRate = 0
   end
+
 end
 
 
 function LifeSafer_LowHealth_ManaCheck()
 
   local mana, frame = "UNIT_MANA", getglobal("LowHealthWarningFrame")
+
   if (LifeSafer_LowHealth_ManaEnabled and UnitPowerType("player") == 0) then
     -- player is using mana
     frame:RegisterEvent(mana)
@@ -246,6 +267,7 @@ function LifeSafer_LowHealth_ManaCheck()
     frame:UnregisterEvent(mana)
     LifeSafer_LowHealth_FlashFrameStop(LifeSafer_LowHealth_ManaFrame, mana)
   end
+
 end
 
 
@@ -263,11 +285,13 @@ end
 
 
 function LifeSafer_LowHealth_GetHeartRate(state)
+
   if (state and state == "UNIT_MANA") then
     return 0.5 + 2.0 * UnitMana("player") / UnitManaMax("player")
   else
     return 0.5 + 2.0 * UnitHealth("player") / UnitHealthMax("player")
   end
+
 end