diff --git a/core.lua b/core.lua
index 11cc85a..ccf8786 100644
--- a/core.lua
+++ b/core.lua
@@ -1,4 +1,4 @@
-AuxVersion = '2.2.12'
+AuxVersion = '2.2.13'
 AuxAuthors = 'shirsig; Zerf; Zirco (Auctionator); Nimeral (Auctionator backport)'
 
 local lastRightClickAction = GetTime()
diff --git a/filter_search_frame.lua b/filter_search_frame.lua
index 7d68581..37729fc 100644
--- a/filter_search_frame.lua
+++ b/filter_search_frame.lua
@@ -136,8 +136,8 @@ public.views = {
                 comparator = function(group1, group2)
                     local market_price1 = Aux.history.get_market_value(group1[1].item_key)
                     local market_price2 = Aux.history.get_market_value(group2[1].item_key)
-                    local factor1 = market_price1 and group1[1].buyout_price_per_unit / market_price1
-                    local factor2 = market_price2 and group2[1].buyout_price_per_unit / market_price2
+                    local factor1 = market_price1 > 0 and group1[1].buyout_price_per_unit / market_price1
+                    local factor2 = market_price2 > 0 and group2[1].buyout_price_per_unit / market_price2
                     return Aux.util.compare(factor1, factor2, Aux.util.GT)
                 end,
                 cell_initializer = Aux.sheet.default_cell_initializer('RIGHT'),
@@ -489,8 +489,8 @@ public.views = {
                 comparator = function(row1, row2)
                     local market_price1 = Aux.history.get_market_value(row1.item_key)
                     local market_price2 = Aux.history.get_market_value(row2.item_key)
-                    local factor1 = market_price1 and row1.buyout_price_per_unit / market_price1
-                    local factor2 = market_price2 and row2.buyout_price_per_unit / market_price2
+                    local factor1 = market_price1 > 0 and row1.buyout_price_per_unit and row1.buyout_price_per_unit / market_price1
+                    local factor2 = market_price2 > 0 and row2.buyout_price_per_unit and row2.buyout_price_per_unit / market_price2
                     return Aux.util.compare(factor1, factor2, Aux.util.GT)
                 end,
                 cell_initializer = Aux.sheet.default_cell_initializer('RIGHT'),
diff --git a/item_search_frame.lua b/item_search_frame.lua
index 88e6803..607c58b 100644
--- a/item_search_frame.lua
+++ b/item_search_frame.lua
@@ -149,8 +149,8 @@ public.views = {
                 comparator = function(group1, group2)
                     local market_price1 = Aux.history.get_market_value(group1[1].item_key)
                     local market_price2 = Aux.history.get_market_value(group2[1].item_key)
-                    local factor1 = market_price1 and group1[1].buyout_price_per_unit / market_price1
-                    local factor2 = market_price2 and group2[1].buyout_price_per_unit / market_price2
+                    local factor1 = market_price1 > 0 and group1[1].buyout_price_per_unit / market_price1
+                    local factor2 = market_price2 > 0 and group2[1].buyout_price_per_unit / market_price2
                     return Aux.util.compare(factor1, factor2, Aux.util.GT)
                 end,
                 cell_initializer = Aux.sheet.default_cell_initializer('RIGHT'),
@@ -428,8 +428,8 @@ public.views = {
                 comparator = function(row1, row2)
                     local market_price1 = Aux.history.get_market_value(row1.item_key)
                     local market_price2 = Aux.history.get_market_value(row2.item_key)
-                    local factor1 = market_price1 and row1.buyout_price_per_unit / market_price1
-                    local factor2 = market_price2 and row2.buyout_price_per_unit / market_price2
+                    local factor1 = market_price1 > 0 and row1.buyout_price_per_unit and row1.buyout_price_per_unit / market_price1
+                    local factor2 = market_price2 > 0 and row2.buyout_price_per_unit and row2.buyout_price_per_unit / market_price2
                     return Aux.util.compare(factor1, factor2, Aux.util.GT)
                 end,
                 cell_initializer = Aux.sheet.default_cell_initializer('RIGHT'),