diff --git a/libsignal/service/src/main/java/org/whispersystems/signalservice/api/messages/EnvelopeContentValidator.kt b/libsignal/service/src/main/java/org/whispersystems/signalservice/api/messages/EnvelopeContentValidator.kt
index 0478244ad4..5b571de1b6 100644
--- a/libsignal/service/src/main/java/org/whispersystems/signalservice/api/messages/EnvelopeContentValidator.kt
+++ b/libsignal/service/src/main/java/org/whispersystems/signalservice/api/messages/EnvelopeContentValidator.kt
@@ -39,6 +39,7 @@ object EnvelopeContentValidator {
       content.hasDataMessage() -> validateDataMessage(envelope, content.dataMessage)
       content.hasSyncMessage() -> validateSyncMessage(envelope, content.syncMessage)
       content.hasCallMessage() -> Result.Valid
+      content.hasNullMessage() -> Result.Valid
       content.hasReceiptMessage() -> validateReceiptMessage(content.receiptMessage)
       content.hasTypingMessage() -> validateTypingMessage(envelope, content.typingMessage)
       content.hasDecryptionErrorMessage() -> validateDecryptionErrorMessage(content.decryptionErrorMessage.toByteArray())