diff --git a/apps/ios/Shared/Views/Onboarding/CreateProfile.swift b/apps/ios/Shared/Views/Onboarding/CreateProfile.swift
index f5db37dac..3f835e25d 100644
--- a/apps/ios/Shared/Views/Onboarding/CreateProfile.swift
+++ b/apps/ios/Shared/Views/Onboarding/CreateProfile.swift
@@ -11,12 +11,14 @@ import SimpleXChat
 
 enum UserProfileAlert: Identifiable {
     case duplicateUserError
+    case invalidDisplayNameError
     case createUserError(error: LocalizedStringKey)
     case invalidNameError(validName: String)
 
     var id: String {
         switch self {
         case .duplicateUserError: return "duplicateUserError"
+        case .invalidDisplayNameError: return "invalidDisplayNameError"
         case .createUserError: return "createUserError"
         case let .invalidNameError(validName): return "invalidNameError \(validName)"
         }
@@ -187,6 +189,12 @@ private func createProfile(_ displayName: String, showAlert: (UserProfileAlert)
             } else {
                 showAlert(.duplicateUserError)
             }
+        case .chatCmdError(_, .error(.invalidDisplayName)):
+            if m.currentUser == nil {
+                AlertManager.shared.showAlert(invalidDisplayNameAlert)
+            } else {
+                showAlert(.invalidDisplayNameError)
+            }
         default:
             let err: LocalizedStringKey = "Error: \(responseError(error))"
             if m.currentUser == nil {
@@ -207,6 +215,7 @@ private func canCreateProfile(_ displayName: String) -> Bool {
 func userProfileAlert(_ alert: UserProfileAlert, _ displayName: Binding<String>) -> Alert {
     switch alert {
     case .duplicateUserError: return duplicateUserAlert
+    case .invalidDisplayNameError: return invalidDisplayNameAlert
     case let .createUserError(err): return creatUserErrorAlert(err)
     case let .invalidNameError(name): return createInvalidNameAlert(name, displayName)
     }
@@ -219,6 +228,13 @@ private var duplicateUserAlert: Alert {
     )
 }
 
+private var invalidDisplayNameAlert: Alert {
+    Alert(
+        title: Text("Invalid display name!"),
+        message: Text("This display name is invalid. Please choose another name.")
+    )
+}
+
 private func creatUserErrorAlert(_ err: LocalizedStringKey) -> Alert {
     Alert(
         title: Text("Error creating profile!"),
diff --git a/apps/ios/SimpleXChat/APITypes.swift b/apps/ios/SimpleXChat/APITypes.swift
index 411a1ab9c..1a8f935f2 100644
--- a/apps/ios/SimpleXChat/APITypes.swift
+++ b/apps/ios/SimpleXChat/APITypes.swift
@@ -1610,6 +1610,7 @@ public enum ChatErrorType: Decodable {
     case userUnknown
     case activeUserExists
     case userExists
+    case invalidDisplayName
     case differentActiveUser(commandUserId: Int64, activeUserId: Int64)
     case cantDeleteActiveUser(userId: Int64)
     case cantDeleteLastUser(userId: Int64)
diff --git a/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt b/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt
index 700bdc4a5..60157f014 100644
--- a/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt
+++ b/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt
@@ -506,6 +506,10 @@ object ChatController {
       r is CR.ChatCmdError && r.chatError is ChatError.ChatErrorChat && r.chatError.errorType is ChatErrorType.UserExists
     ) {
       AlertManager.shared.showAlertMsg(generalGetString(MR.strings.failed_to_create_user_duplicate_title), generalGetString(MR.strings.failed_to_create_user_duplicate_desc))
+    } else if (
+      r is CR.ChatCmdError && r.chatError is ChatError.ChatErrorChat && r.chatError.errorType is ChatErrorType.InvalidDisplayName
+    ) {
+      AlertManager.shared.showAlertMsg(generalGetString(MR.strings.failed_to_create_user_invalid_title), generalGetString(MR.strings.failed_to_create_user_invalid_desc))
     } else {
       AlertManager.shared.showAlertMsg(generalGetString(MR.strings.failed_to_create_user_title), r.details)
     }
@@ -4493,6 +4497,7 @@ sealed class ChatErrorType {
       is EmptyUserPassword -> "emptyUserPassword"
       is UserAlreadyHidden -> "userAlreadyHidden"
       is UserNotHidden -> "userNotHidden"
+      is InvalidDisplayName -> "invalidDisplayName"
       is ChatNotStarted -> "chatNotStarted"
       is ChatNotStopped -> "chatNotStopped"
       is ChatStoreChanged -> "chatStoreChanged"
@@ -4570,6 +4575,7 @@ sealed class ChatErrorType {
   @Serializable @SerialName("emptyUserPassword") class EmptyUserPassword(val userId: Long): ChatErrorType()
   @Serializable @SerialName("userAlreadyHidden") class UserAlreadyHidden(val userId: Long): ChatErrorType()
   @Serializable @SerialName("userNotHidden") class UserNotHidden(val userId: Long): ChatErrorType()
+  @Serializable @SerialName("invalidDisplayName") object InvalidDisplayName: ChatErrorType()
   @Serializable @SerialName("chatNotStarted") object ChatNotStarted: ChatErrorType()
   @Serializable @SerialName("chatNotStopped") object ChatNotStopped: ChatErrorType()
   @Serializable @SerialName("chatStoreChanged") object ChatStoreChanged: ChatErrorType()
diff --git a/apps/multiplatform/common/src/commonMain/resources/MR/base/strings.xml b/apps/multiplatform/common/src/commonMain/resources/MR/base/strings.xml
index 45c8bfe48..e3870c66a 100644
--- a/apps/multiplatform/common/src/commonMain/resources/MR/base/strings.xml
+++ b/apps/multiplatform/common/src/commonMain/resources/MR/base/strings.xml
@@ -90,6 +90,8 @@
   <string name="failed_to_create_user_title">Error creating profile!</string>
   <string name="failed_to_create_user_duplicate_title">Duplicate display name!</string>
   <string name="failed_to_create_user_duplicate_desc">You already have a chat profile with the same display name. Please choose another name.</string>
+  <string name="failed_to_create_user_invalid_title">Invalid display name!</string>
+  <string name="failed_to_create_user_invalid_desc">This display name is invalid. Please choose another name.</string>
   <string name="failed_to_active_user_title">Error switching profile!</string>
 
   <!-- API Error Responses - SimpleXAPI.kt -->