From 91863768854a8ea43f957ce003da12674cb2821a Mon Sep 17 00:00:00 2001
From: Tangem <git@tangem.com>
Date: Sat, 2 Mar 2024 13:09:13 +0000
Subject: [PATCH] Updated on 2026-08-14

---
 .../com/tangem/feature/swap/ui/StateBuilder.kt   |  4 ++--
 .../feature/swap/viewmodels/SwapViewModel.kt     | 16 ++++++++++++++--
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/features/swap/presentation/src/main/java/com/tangem/feature/swap/ui/StateBuilder.kt b/features/swap/presentation/src/main/java/com/tangem/feature/swap/ui/StateBuilder.kt
index 53e3148278..5e8c386764 100644
--- a/features/swap/presentation/src/main/java/com/tangem/feature/swap/ui/StateBuilder.kt
+++ b/features/swap/presentation/src/main/java/com/tangem/feature/swap/ui/StateBuilder.kt
@@ -888,10 +888,10 @@ internal class StateBuilder(
         )
     }
 
-    fun addAlert(uiState: SwapStateHolder, onClick: () -> Unit): SwapStateHolder {
+    fun addAlert(uiState: SwapStateHolder, message: TextReference? = null, onClick: () -> Unit): SwapStateHolder {
         return uiState.copy(
             alert = SwapWarning.GenericWarning(
-                message = null,
+                message = message,
                 onClick = onClick,
             ),
         )
diff --git a/features/swap/presentation/src/main/java/com/tangem/feature/swap/viewmodels/SwapViewModel.kt b/features/swap/presentation/src/main/java/com/tangem/feature/swap/viewmodels/SwapViewModel.kt
index d194494046..39ca0d7991 100644
--- a/features/swap/presentation/src/main/java/com/tangem/feature/swap/viewmodels/SwapViewModel.kt
+++ b/features/swap/presentation/src/main/java/com/tangem/feature/swap/viewmodels/SwapViewModel.kt
@@ -8,6 +8,7 @@ import arrow.core.getOrElse
 import com.tangem.core.analytics.api.AnalyticsEventHandler
 import com.tangem.core.analytics.models.AnalyticsParam
 import com.tangem.core.analytics.models.Basic
+import com.tangem.core.ui.extensions.TextReference
 import com.tangem.core.ui.utils.InputNumberFormatter
 import com.tangem.domain.appcurrency.GetSelectedAppCurrencyUseCase
 import com.tangem.domain.appcurrency.model.AppCurrency
@@ -113,7 +114,7 @@ internal class SwapViewModel @Inject constructor(
                 val cryptoCurrencyStatus =
                     getCryptoCurrencyStatusUseCase(it.walletId, initialCryptoCurrency.id).getOrNull()
                 if (cryptoCurrencyStatus == null) {
-                    uiState = stateBuilder.addAlert(uiState, swapRouter::back)
+                    uiState = stateBuilder.addAlert(uiState = uiState, onClick = swapRouter::back)
                 } else {
                     initialCryptoCurrencyStatus = cryptoCurrencyStatus
                     initTokens()
@@ -459,7 +460,12 @@ internal class SwapViewModel @Inject constructor(
             return
         }
         val fromCurrency = requireNotNull(dataState.fromCryptoCurrency)
-        val fee = requireNotNull(dataState.selectedFee)
+        val fee = dataState.selectedFee
+        // TODO: unexpected crash for some users, this workaround to prevent app crash and follow to support
+        if (fee == null) {
+            makeDefaultAlert(TextReference.Str("Fee estimation error. Please send feedback to support."))
+            return
+        }
         viewModelScope.launch(dispatchers.main) {
             runCatching(dispatchers.io) {
                 swapInteractor.onSwap(
@@ -749,6 +755,12 @@ internal class SwapViewModel @Inject constructor(
         }
     }
 
+    private fun makeDefaultAlert(message: TextReference) {
+        uiState = stateBuilder.addAlert(uiState, message) {
+            uiState = stateBuilder.clearAlert(uiState)
+        }
+    }
+
     @Suppress("LongMethod", "CyclomaticComplexMethod")
     private fun createUiActions(): UiActions {
         return UiActions(