Updated on 2026-08-14

domain/legacy/src/main/java/com/tangem/domain/common/extensions/Blockchain.kt

@@ -261,4 +261,5 @@ private const val NODL_AMOUNT_TO_CREATE_ACCOUNT = 1.5
 private val excludedBlockchains = listOf(
     Blockchain.Unknown,
     Blockchain.Playa3ull,
+    Blockchain.Hedera,
 )

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,
             ),
         )

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(

gradle/dependencies.toml

@@ -85,7 +85,7 @@ web3j = "4.10.1"
 # endregion Other libraries
 
 # region Tangem
-tangemBlockchainSdk = "release-app_5.7-506"
+tangemBlockchainSdk = "release-app_5.7-509"
 #tangemBlockchainSdk = "0.0.1" # Keep it! - used for local builds
 tangemCardSdk = "release-app_5.7-330"
 #tangemCardSdk = "0.0.1" # Keep it! - used for local builds ^