diff --git a/src/main/kotlin/main/VpcSpigotIntegration/SignHandler.kt b/src/main/kotlin/main/VpcSpigotIntegration/SignHandler.kt
index cc56e89..89bebee 100644
--- a/src/main/kotlin/main/VpcSpigotIntegration/SignHandler.kt
+++ b/src/main/kotlin/main/VpcSpigotIntegration/SignHandler.kt
@@ -38,7 +38,7 @@ import java.util.Locale.getDefault
 class SignPaymentInfo(
     public val amount: Int,
     public val type: Material,
-    public val container: Chest,
+    public val container: Container,
     public val player: Player,
     public val cost: Double,
     public val dst_username: String
@@ -51,7 +51,7 @@ class SignHandler: Listener {
         if (!PAY_BY_SIGN) return
 
         // Check if clicked block is a sign
-        val block = event.clickedBlock!!
+        val block = event.clickedBlock
         if (block.type != Material.SIGN_POST && block.type != Material.WALL_SIGN) return
         // Verify it's actually a sign state
         val state = block.state
@@ -66,7 +66,11 @@ class SignHandler: Listener {
 
         // Check if player already have open invoices
         if (TO_PAY_SIGN_INVOICES.contains(event.player.name)) {
-            Utils.send(event.player, "&cУ вас уже есть открытый счёт, сначала оплатите его.")
+            val message = TextComponent(ChatColor.translateAlternateColorCodes('&',"&cУ вас уже есть открытый счёт, сначала оплатите его или &6отмените."))
+            message.clickEvent = ClickEvent(ClickEvent.Action.RUN_COMMAND, "/vpi signPay cancel")
+            message.hoverEvent = HoverEvent(HoverEvent.Action.SHOW_TEXT,
+                ComponentBuilder("/vpi signPay cancel").create())
+            event.player.spigot().sendMessage(message)
             return
         }
 
@@ -93,9 +97,9 @@ class SignHandler: Listener {
         val containerBlock = getWorld(event.clickedBlock.world.uid).getBlockAt(cordX, cordY, cordZ)
         LOGGER.info("Container block: $cordX $cordY $cordZ")
 
-        val container: Chest = containerBlock.state as Chest
-        LOGGER.info("Content: ${container.blockInventory.contents}")
-        var firstItem = container.blockInventory.contents.filterNotNull().firstOrNull()
+        val container: Container = containerBlock.state as Container
+        LOGGER.info("Content: ${container.inventory.contents}")
+        var firstItem = container.inventory.contents.filterNotNull().firstOrNull()
         if (firstItem == null) {
             Utils.send(event.player,"&cВ контейнере нет предметов для покупки.")
         }
@@ -155,7 +159,7 @@ class SignHandler: Listener {
 
             var coloredLine: String
             // Check if some data is missing
-            if (vpcUsername.isEmpty() || cost == null || amount == null || amount < 0 || cost < 0) {
+            if (vpcUsername.isEmpty() || cost == null || amount == null || amount < 0 || cost < 0 || cost < 0.0001) {
                 coloredLine = ChatColor.translateAlternateColorCodes('&', "$PREFIX&cError")
                 event.setLine(0, coloredLine)
                 return
diff --git a/src/main/kotlin/main/VpcSpigotIntegration/VpcServerIntegration.kt b/src/main/kotlin/main/VpcSpigotIntegration/VpcServerIntegration.kt
index 2368b0c..2620e73 100644
--- a/src/main/kotlin/main/VpcSpigotIntegration/VpcServerIntegration.kt
+++ b/src/main/kotlin/main/VpcSpigotIntegration/VpcServerIntegration.kt
@@ -277,6 +277,18 @@ pay_by_sign=${DEFAULT_PAY_BY_SIGN}
 					Utils.send(sender, "/vpi auth <ник>")
 				}
 
+                // Cancel sign pay
+                args[0] == "signPay" && args[1] == "cancel" -> {
+                    val invoiceId = TO_PAY_INVOICES[sender.name].toString()
+                    VpcApi.delete_invoice(invoiceId)
+                    synchronized(TO_PAY_SIGN_INVOICES) {
+                        TO_PAY_SIGN_INVOICES.remove(sender.name)
+                        INVOICE_CREATION_TIMES.remove(invoiceId)
+                        SIGN_PAYMENT_INFO.remove(invoiceId)
+                    }
+                    Utils.send(sender, "Счёт успешно отменён.")
+                }
+
 				// Default help menu
 				else -> {
 					showHelpMenu(sender)
@@ -720,14 +732,22 @@ pay_by_sign=${DEFAULT_PAY_BY_SIGN}
                                         Utils.send(paymentInfo.player, "&cНевозможно вернуть VPC, обратитесь к администратору: $transferResult")
                                     }
 								} else {
-									// If we have needed items
-									paymentInfo.player.inventory.addItem(itemStack)
-									paymentInfo.container.inventory.removeItem(itemStack)
-
-									val transferResult = VpcApi.transfer_coins(paymentInfo.dst_username, paymentInfo.cost).toString()
-									if (transferResult != "OK") {
-										LOGGER.error("Can't transfer VPC, result: $transferResult")
-									}
+                                    // If we have needed items
+                                    val transferResult = VpcApi.transfer_coins(paymentInfo.dst_username, paymentInfo.cost).toString()
+                                    if (transferResult != "OK") {
+                                        LOGGER.error("Can't transfer VPC, result: $transferResult")
+                                        Utils.send(paymentInfo.player, "&cПеревод адресату невозможен, отмена покупки.")
+                                        // Return VPC
+                                        val vpcUsername = DataManager.getPlayerVPCUsername(paymentInfo.player.name).toString()
+                                        val transferResult = VpcApi.transfer_coins(vpcUsername, paymentInfo.cost).toString()
+                                        if (transferResult != "OK") {
+                                            LOGGER.error("Can't return VPC, result: $transferResult")
+                                            Utils.send(paymentInfo.player, "&cНевозможно вернуть VPC, обратитесь к администратору: $transferResult")
+                                        }
+                                    } else {
+                                        paymentInfo.player.inventory.addItem(itemStack)
+                                        paymentInfo.container.inventory.removeItem(itemStack)
+                                    }
 								}
 
 								// Clean up tracking maps