Unknown message/webhook/interaction null

object ReportModal : ModalExecutor {
    private val REPORT_ROLE_MENTION = "<@&${dotenv["REPORT_ROLE_ID"]}>"

    override suspend fun onSubmit(interaction: ModalSubmitInteraction) {
        interaction.updateEphemeralMessage {}
        val message = unfinishedReports.remove(interaction.user) ?: return
        val author = message.author ?: return
        val user = interaction.user

        interaction.channel.createMessage(REPORT_ROLE_MENTION).delete()
        interaction.channel.createMessage {
            embed {
                title = "Message Report"
                // url = message.url()
                description = "The following message has been reported for breaking the rules"
                field("Reported Message") { message.content }
                field("Reason", true) { interaction.textInputs["reason"]!!.value!! }
                field("Report Score", true) { "0/$REPORT_SCORE_THRESHOLD" }
                // field(message.url(), true)
                author {
                    name = author.effectiveName
                    icon = author.avatar?.cdnUrl?.toUrl()
                }
                footer {
                    text = "Reported by ${user.effectiveName}"
                    icon = user.avatar?.cdnUrl?.toUrl()
                }
            }
            actionRow {
                interactionButton(ButtonStyle.Success, "confirm") { label = "Confirm" }
                interactionButton(ButtonStyle.Danger, "reject") { label = "Mark as false" }
            }
        }.let { pendingReports[it.id] = Report(message, user) }
    }
}