diff --git a/backend/internal/service/admin_account.go b/backend/internal/service/admin_account.go
index 59317c3eb4..2e6b000ed4 100644
--- a/backend/internal/service/admin_account.go
+++ b/backend/internal/service/admin_account.go
@@ -121,7 +121,13 @@ func normalizeOpenAILongContextBillingUpdateExtra(account *Account, input *Updat
 		return normalized, nil
 	}
 
-	incoming := normalized[openAILongContextBillingEnabledKey].(bool)
+	incoming, ok := normalized[openAILongContextBillingEnabledKey].(bool)
+	if !ok {
+		return nil, infraerrors.BadRequest(
+			"OPENAI_LONG_CONTEXT_BILLING_INVALID",
+			"openai_long_context_billing_enabled must be a boolean",
+		)
+	}
 	importSource, _ := input.Extra["import_source"].(string)
 	accessToken, _ := input.Credentials["access_token"].(string)
 	isCodexSessionImport := importSource == "codex_session" && strings.TrimSpace(accessToken) != ""