diff --git a/bot/common/invitations/main.go b/bot/common/invitations/main.go
index 16c00c7..27edb49 100644
--- a/bot/common/invitations/main.go
+++ b/bot/common/invitations/main.go
@@ -1,6 +1,7 @@
 package invitations
 
 import (
+	"github.com/PaulSonOfLars/gotgbot/v2"
 	"github.com/PaulSonOfLars/gotgbot/v2/ext"
 	"github.com/PaulSonOfLars/gotgbot/v2/ext/handlers"
 	"github.com/PaulSonOfLars/gotgbot/v2/ext/handlers/filters/callbackquery"
@@ -40,9 +41,36 @@ const (
 func InitInvitations(dispatcher *ext.Dispatcher) {
 	rootHandler := NewRootHandler()
 
+	// Commands
 	dispatcher.AddHandler(handlers.NewCommand(string(InviteCommand), rootHandler.init(InviteCommand)))
 	dispatcher.AddHandler(handlers.NewCommand(string(RegisterCommand), rootHandler.init(RegisterCommand)))
+
+	// Callbacks
 	dispatcher.AddHandler(handlers.NewCallback(callbackquery.Prefix("inv|g"), rootHandler.init(GenerateInvitationCallback)))
 	dispatcher.AddHandler(handlers.NewCallback(callbackquery.Prefix("inv|reg|c"), rootHandler.init(CancelSendingInvitationCodeCallback)))
+}
+
+func ProcessText(b *gotgbot.Bot, ctx *ext.Context) (bool, error) {
+	rh := NewRootHandler()
+	err := rh.HandleUserAndRepos(ctx)
+	if err != nil {
+		return false, err
+	}
 
+	switch rh.user.State {
+	case GeneratingInvitationState:
+		err = rh.GenerateInvitation(b, ctx)
+		if err != nil {
+			return true, err
+		}
+		return true, nil
+	case SendingInvitationCodeState:
+		err = rh.ValidateCode(b, ctx)
+		if err != nil {
+			return true, err
+		}
+		return true, nil
+	default:
+		return false, nil
+	}
 }
diff --git a/bot/common/invitations/root_handler.go b/bot/common/invitations/root_handler.go
index f4c6faa..a1285d4 100644
--- a/bot/common/invitations/root_handler.go
+++ b/bot/common/invitations/root_handler.go
@@ -36,11 +36,15 @@ func (r *RootHandler) HandleUserAndRepos(ctx *ext.Context) error {
 	if err != nil {
 		return fmt.Errorf("failed to init db repo: %w", err)
 	}
-	user, err := r.processUser(userRepo, ctx)
 
-	if err != nil || user == nil {
-		return fmt.Errorf("failed to process user: %w", err)
+	user, err := userRepo.ReadUserByUserId(ctx.EffectiveUser.Id)
+	if err != nil {
+		user, err = userRepo.CreateUser(ctx.EffectiveUser.Id)
+		if err != nil || user == nil {
+			return fmt.Errorf("failed to process user: %w", err)
+		}
 	}
+
 	r.user = user
 	r.userRepo = *userRepo
 
@@ -66,8 +70,6 @@ func (r *RootHandler) runCommand(b *gotgbot.Bot, ctx *ext.Context, command inter
 			return r.inviteCommandHandler(b, ctx)
 		case RegisterCommand:
 			return r.registerCommandHandler(b, ctx)
-		default:
-			return fmt.Errorf("unknown command: %s", c)
 		}
 	case CallbackCommand:
 		// Reset user state if necessary
@@ -83,24 +85,9 @@ func (r *RootHandler) runCommand(b *gotgbot.Bot, ctx *ext.Context, command inter
 			return r.manageInvitation(b, ctx, "GENERATE")
 		case CancelSendingInvitationCodeCallback:
 			return r.invitationCodeCallback(b, ctx, "CANCEL")
-		default:
-			return fmt.Errorf("unknown command: %s", c)
 		}
-	default:
-		return fmt.Errorf("unknown command: %s", command)
 	}
-}
-
-func (r *RootHandler) processUser(userRepo *users.UserRepository, ctx *ext.Context) (*users.User, error) {
-	user, err := userRepo.ReadUserByUserId(ctx.EffectiveUser.Id)
-	if err != nil {
-		user, err = userRepo.CreateUser(ctx.EffectiveUser.Id)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	return user, nil
+	return nil
 }
 
 func (r *RootHandler) inviteCommandHandler(b *gotgbot.Bot, ctx *ext.Context) error {
diff --git a/bot/common/invitations/utils.go b/bot/common/invitations/utils.go
index bb68024..3e629b5 100644
--- a/bot/common/invitations/utils.go
+++ b/bot/common/invitations/utils.go
@@ -11,7 +11,7 @@ import (
 
 // generateRandomString generates a random string of a specified length from a predefined charset.
 func generateRandomString(length int) (string, error) {
-	const charset = "abcdefghijklmnopqrstuvwxyz0123456789"
+	const charset = "abcdefghijkmnpqrstuvwxyz123456789"
 
 	result := make([]byte, length)
 	for i := range result {
diff --git a/bot/common/misc.go b/bot/common/misc.go
index 84f859a..af2fd33 100644
--- a/bot/common/misc.go
+++ b/bot/common/misc.go
@@ -182,22 +182,16 @@ func (r *RootHandler) processText(b *gotgbot.Bot, ctx *ext.Context) error {
 		return r.sendAnonymousMessage(b, ctx)
 	case users.SettingUsername:
 		return r.setUsername(b, ctx)
-	case invitations.GeneratingInvitationState:
-		irh := invitations.NewRootHandler()
-		err := irh.HandleUserAndRepos(ctx)
+	default:
+		processed, err := invitations.ProcessText(b, ctx)
 		if err != nil {
 			return err
 		}
-		return irh.GenerateInvitation(b, ctx)
-	case invitations.SendingInvitationCodeState:
-		irh := invitations.NewRootHandler()
-		err := irh.HandleUserAndRepos(ctx)
-		if err != nil {
-			return err
+		if processed == false {
+			return r.sendError(b, ctx, i18n.T(i18n.InvalidCommandText))
+		} else {
+			return nil
 		}
-		return irh.ValidateCode(b, ctx)
-	default:
-		return r.sendError(b, ctx, i18n.T(i18n.InvalidCommandText))
 	}
 }