diff --git a/core/ShopState.lua b/core/ShopState.lua
index 275b834..55a6f60 100644
--- a/core/ShopState.lua
+++ b/core/ShopState.lua
@@ -166,7 +166,16 @@
         end
     end
     if self.eventHooks and self.eventHooks.preStockCheck then
-        eventHook.execute(self.eventHooks.preStockCheck, transaction, productsPurchased, self.products)
+        local allowPurchase, err, errMessage, invisible = eventHook.execute(self.eventHooks.preStockCheck, transaction, productsPurchased, self.products)
+        if allowPurchase == false then
+            if not invisible then
+                refund(transactionCurrency, transaction.from, meta, transaction.value, errMessage or self.config.lang.refundDenied, err)
+                if self.eventHooks and self.eventHooks.failedPurchase then
+                    eventHook.execute(self.eventHooks.failedPurchase, transaction, transactionCurrency, purchasedProduct, errMessage or self.config.lang.refundDenied, err)
+                end
+            end
+            return
+        end
     end
     local available = amountPurchased
     for _, productPurchased in ipairs(productsPurchased) do
diff --git a/eventHooks.lua b/eventHooks.lua
index c5a12fe..49c6c51 100644
--- a/eventHooks.lua
+++ b/eventHooks.lua
@@ -4,7 +4,7 @@
     -- If product is nil, product will be selected by the shop,
     -- If product is false, customer will be refunded for no product found.
     -- If product is false and errored is true, customer will be refunded with error message.
-    preStockCheck = nil, -- function(transaction, productsPurchased, products)
+    preStockCheck = nil, -- function(transaction, productsPurchased, products) returns continueTransaction, errored, errorMessage, invisible
     prePurchase = nil, -- function(product, amount, refundAmount, transaction, transactionCurrency) returns continueTransaction, errored, errorMessage, invisible
     purchase = nil, -- function(product, amount, refundAmount, transaction, transactionCurrency)
     failedPurchase = nil, -- function(transaction, transactionCurrency, product, errorMessage)