diff --git a/db/reg_pollers.lua b/db/reg_pollers.lua
index 20287ab..b6702f3 100644
--- a/db/reg_pollers.lua
+++ b/db/reg_pollers.lua
@@ -1,4 +1,5 @@
 fiber = require 'fiber'
+decimal = require 'decimal'
 
 function reg_pollers_migration_v1()
     if box.space.reg_pollers ~= nil then
@@ -43,6 +44,7 @@ local function wrap_rp(rp)
 end
 
 function get_free_reg_poller(amount, sym, step, now)
+    amount = decimal.new(amount) -- fix "1.1 + 0.1 ~= 1.2" problem
     local rps = nil
     repeat
         if rps ~= nil then
@@ -55,7 +57,7 @@ function get_free_reg_poller(amount, sym, step, now)
         end
         rps = box.space.reg_pollers.index.by_amount:select{sym, amount}
     until #rps == 0
-    return amount
+    return tostring(amount)
 end
 
 local function clean_reg_pollers(now)
diff --git a/src/locales/en.json b/src/locales/en.json
index 27f147b..87828e7 100644
--- a/src/locales/en.json
+++ b/src/locales/en.json
@@ -103,6 +103,7 @@
     "min_amount": "Minimal amount is ",
     "enter_amount": "Exact amount, which will be transferred by gate: ",
     "slot_is_used": "Try another amount.",
+    "eg": " E.g.: ",
     "fee": "Fee",
     "memo_fixed": "Memo",
     "to": "Send tokens to address/account",
diff --git a/src/locales/ru-RU.json b/src/locales/ru-RU.json
index d5ab5c8..177db6b 100644
--- a/src/locales/ru-RU.json
+++ b/src/locales/ru-RU.json
@@ -103,6 +103,7 @@
     "min_amount": "Минимальная сумма - ",
     "enter_amount": "Точная сумма, которую вы отправите шлюзу: ",
     "slot_is_used": "Введите другую сумму.",
+    "eg": " Например: ",
     "fee": "Комиссия",
     "memo_fixed": "Заметка/memo",
     "to": "Отправьте токены на адрес/аккаунт",
diff --git a/src/modules/register/UIARegister.jsx b/src/modules/register/UIARegister.jsx
index c1307b8..371dd3c 100644
--- a/src/modules/register/UIARegister.jsx
+++ b/src/modules/register/UIARegister.jsx
@@ -494,6 +494,7 @@ class UIARegister extends React.Component {
 
     _onAmountSubmit = async (values) => {
         const waitAmount = values.amount.asset
+        let freeAmount
         try {
             let fp = await callApi('/api/reg/get_free_poller/' + waitAmount.toString())
             fp = await fp.json()
@@ -501,11 +502,14 @@ class UIARegister extends React.Component {
                 throw new Error(fp.error || 'Unknown error')
             }
             if (fp.amount !== waitAmount.toString()) {
+                freeAmount = parseFloat(fp.amount)
                 throw new Error('Slot is used')
             }
         } catch (err) {
             this.setState({
-                amountSubmitError: err.message === 'Slot is used' ? tt('uia_register_jsx.slot_is_used') : err.message
+                amountSubmitError: err.message === 'Slot is used' ?
+                    tt('uia_register_jsx.slot_is_used') + (freeAmount ? (tt('uia_register_jsx.eg') + freeAmount + '.') : '' )
+                    : err.message
             })
             return
         }
diff --git a/src/pages/api/reg/[...all].js b/src/pages/api/reg/[...all].js
index 96cd669..65a0047 100644
--- a/src/pages/api/reg/[...all].js
+++ b/src/pages/api/reg/[...all].js
@@ -536,7 +536,6 @@ let handler = nextConnect({ attachParams: true, })
                 error = tt('uia_register_jsx.cannot_check_orders') + exAmount.symbol + '/' + sym2
             }
             if (error) break
-            console.log(exAmount.toString(), sym2, JSON.stringify(resEx))
             if (resEx.remain) {
                 error = tt('uia_register_jsx.too_low_orders') + exAmount.symbol + '/' + sym2 + tt('uia_register_jsx.cannot_register_with_it')
                 break