diff --git a/packettypes.h b/packettypes.h
index ef471e6..23ce742 100644
--- a/packettypes.h
+++ b/packettypes.h
@@ -15,7 +15,7 @@
 #define LOCK_PERIOD 10                  // How long to try to lock mutex (ms)
 #define STALE_CONNECTION 15             // Not heard from in this many seconds
 #define BUFSIZE 500 // Number of packets to buffer
-#define MAX_MISSING 400 // Make the maximum number of possible missing packets less than total buffer size!
+#define MAX_MISSING 100 // Make the maximum number of possible missing packets much less than total buffer size!
 #define TXAUDIO_PERIOD 20 
 
 
diff --git a/udpserver.cpp b/udpserver.cpp
index a79c4ee..09a89af 100644
--- a/udpserver.cpp
+++ b/udpserver.cpp
@@ -1709,7 +1709,7 @@ void udpServer::sendRetransmitRequest(CLIENT* c)
     {
         for (auto it = c->rxMissing.begin(); it != c->rxMissing.end(); ++it)
         {
-            if (it.value() < 4)
+            if (&it != Q_NULLPTR && it.value() < 4)
             {
                 missingSeqs.append(it.key() & 0xff);
                 missingSeqs.append(it.key() >> 8 & 0xff);