diff --git a/wled00/e131.cpp b/wled00/e131.cpp
index 86ef7c8b..40cd49d2 100644
--- a/wled00/e131.cpp
+++ b/wled00/e131.cpp
@@ -120,6 +120,7 @@ void handleE131Packet(e131_packet_t* p, IPAddress clientIP, byte protocol){
   // update status info
   realtimeIP = clientIP;
   byte wChannel = 0;
+  uint16_t dmxChannelCount = 0;
   uint16_t totalLen = strip.getLengthTotal();
   uint16_t availDMXLen = 0;
   uint16_t dataOffset = DMXAddress;
@@ -144,13 +145,13 @@ void handleE131Packet(e131_packet_t* p, IPAddress clientIP, byte protocol){
 
     case DMX_MODE_SINGLE_RGB:   // 3-4 channels: [R,G,B] + W (if present)
       if (uni != e131Universe) return;
-      uint16_t dmxChannelCount;
-      dmxChannelCount = strip.hasWhiteChannel() ? 4 : 3;
-      if (availDMXLen < dmxChannelCount) return;
 
       realtimeLock(realtimeTimeoutMs, mde);
       if (realtimeOverride && !(realtimeMode && useMainSegmentOnly)) return;
 
+      dmxChannelCount = useMainSegmentOnly ? strip.getMainSegment().hasWhite() : strip.hasWhiteChannel() ? 4 : 3;
+      if (availDMXLen < dmxChannelCount) return;
+
       wChannel = dmxChannelCount == 4 ? e131_data[dataOffset+3] : 0;
       for (uint16_t i = 0; i < totalLen; i++)
         setRealtimePixel(i, e131_data[dataOffset+0], e131_data[dataOffset+1], e131_data[dataOffset+2], wChannel);
@@ -158,11 +159,12 @@ void handleE131Packet(e131_packet_t* p, IPAddress clientIP, byte protocol){
 
     case DMX_MODE_SINGLE_DRGB:  // 4-5 channels: [Dimmer,R,G,B] + W (if present)
       if (uni != e131Universe) return;
-      dmxChannelCount = strip.hasWhiteChannel() ? 5 : 4;
-      if (availDMXLen < dmxChannelCount) return;
 
       realtimeLock(realtimeTimeoutMs, mde);
       if (realtimeOverride && !(realtimeMode && useMainSegmentOnly)) return;
+      
+      dmxChannelCount = useMainSegmentOnly ? strip.getMainSegment().hasWhite() : strip.hasWhiteChannel() ? 5 : 4;
+      if (availDMXLen < dmxChannelCount) return;
 
       if (bri != e131_data[dataOffset+0]) {
         bri = e131_data[dataOffset+0];