diff --git a/SignalServiceKit/src/Messages/OWSMessageManager.m b/SignalServiceKit/src/Messages/OWSMessageManager.m
index 63c4bb52d..2c31061d8 100644
--- a/SignalServiceKit/src/Messages/OWSMessageManager.m
+++ b/SignalServiceKit/src/Messages/OWSMessageManager.m
@@ -266,7 +266,9 @@ NS_ASSUME_NONNULL_BEGIN
         return;
     }
 
-    OWSAssertDebug(![self isEnvelopeSenderBlocked:envelope]);
+    if ([self isEnvelopeSenderBlocked:envelope]) {
+        return;
+    }
     
     [self checkForUnknownLinkedDevice:envelope transaction:transaction];