diff --git a/src/ATBAPP/ATBDeviceControllerPlugin.cpp b/src/ATBAPP/ATBDeviceControllerPlugin.cpp
index 66c6b90..3adc414 100644
--- a/src/ATBAPP/ATBDeviceControllerPlugin.cpp
+++ b/src/ATBAPP/ATBDeviceControllerPlugin.cpp
@@ -58,6 +58,8 @@ void ATBDeviceControllerPlugin::requestStartCashInput(const QString & amount)
 
     uint32_t amountInt = static_cast<uint32_t>(amount.toUInt());
 
+    if (amountInt == 0) amountInt = UINT_MAX;
+
     hw->cash_startPayment(amountInt);
 }