diff --git a/wled00/FX_2Dfcn.cpp b/wled00/FX_2Dfcn.cpp
index 999684b1..aac0ac76 100644
--- a/wled00/FX_2Dfcn.cpp
+++ b/wled00/FX_2Dfcn.cpp
@@ -80,7 +80,10 @@ void WS2812FX::setUpMatrix() {
       if ((size > 0) && (customMappingTable == nullptr)) { // second try
         DEBUG_PRINTLN("setUpMatrix: trying to get fresh memory block.");
         customMappingTable = (uint16_t*) calloc(size, sizeof(uint16_t));
-        if (customMappingTable == nullptr) USER_PRINTLN("setUpMatrix: alloc failed");
+        if (customMappingTable == nullptr) { 
+          USER_PRINTLN("setUpMatrix: alloc failed");
+          errorFlag = ERR_LOW_MEM; // WLEDMM raise errorflag
+        }
       }
       if (customMappingTable != nullptr) customMappingTableSize = size;
     }
@@ -159,6 +162,7 @@ void WS2812FX::setUpMatrix() {
     } else { // memory allocation error
       customMappingTableSize = 0;
       USER_PRINTLN(F("Ledmap alloc error."));
+      errorFlag = ERR_LOW_MEM; // WLEDMM raise errorflag
       isMatrix = false; //WLEDMM does not like this done in teh background while end users are confused whats happened...
       panels = 0;
       panel.clear();
diff --git a/wled00/FX_fcn.cpp b/wled00/FX_fcn.cpp
index 12f81497..b9f02ac8 100644
--- a/wled00/FX_fcn.cpp
+++ b/wled00/FX_fcn.cpp
@@ -128,10 +128,13 @@ void Segment::allocLeds() {
     if (ledsrgb) free(ledsrgb);   // we need a bigger buffer, so free the old one first
     ledsrgb = (CRGB*)calloc(size, 1);
     ledsrgbSize = ledsrgb?size:0;
-    if (ledsrgb == nullptr) USER_PRINTLN("allocLeds failed!!");
+    if (ledsrgb == nullptr) {
+      USER_PRINTLN("allocLeds failed!!");
+      errorFlag = ERR_LOW_MEM; // WLEDMM raise errorflag
+    }
   }
   else {
-    USER_PRINTF("reuse Leds %u from %u\n", size, ledsrgb?ledsrgbSize:0);
+    //USER_PRINTF("reuse Leds %u from %u\n", size, ledsrgb?ledsrgbSize:0);
   }
 }
 
@@ -212,7 +215,11 @@ bool Segment::allocateData(size_t len) {
   //DEBUG_PRINTF("allocateData(%u) start %d, stop %d, vlen %d\n", len, start, stop, virtualLength());
   deallocateData();
   if (len == 0) return false; // nothing to do
-  if (Segment::getUsedSegmentData() + len > MAX_SEGMENT_DATA) return false; //not enough memory
+  if (Segment::getUsedSegmentData() + len > MAX_SEGMENT_DATA) {
+    //USER_PRINTF("Segment::allocateData: Segment data quota exceeded! used:%u request:%u max:%d\n", Segment::getUsedSegmentData(), len, MAX_SEGMENT_DATA);
+    if (len > 0) errorFlag = ERR_LOW_SEG_MEM;  // WLEDMM raise errorflag
+    return false; //not enough memory
+  }
   // do not use SPI RAM on ESP32 since it is slow
   //#if defined(ARDUINO_ARCH_ESP32) && defined(BOARD_HAS_PSRAM) && defined(WLED_USE_PSRAM)
   //if (psramFound())
@@ -220,10 +227,17 @@ bool Segment::allocateData(size_t len) {
   //else
   //#endif
     data = (byte*) malloc(len);
-  if (!data) { _dataLen = 0; return false;} //allocation failed // WLEDMM reset dataLen
+  if (!data) {
+      _dataLen = 0; // WLEDMM reset dataLen
+      errorFlag = ERR_LOW_MEM; // WLEDMM raise errorflag
+      USER_PRINT(F("Segment::allocateData: FAILED to allocate ")); 
+      USER_PRINT(len); USER_PRINTLN(F(" bytes."));
+      return false;
+  } //allocation failed
   Segment::addUsedSegmentData(len);
   _dataLen = len;
   memset(data, 0, len);
+  if (errorFlag == ERR_LOW_SEG_MEM) errorFlag = ERR_NONE; // WLEDMM reset errorflag on success
   return true;
 }
 
@@ -231,7 +245,7 @@ void Segment::deallocateData() {
   if (!data) {_dataLen = 0; return;}  // WLEDMM reset dataLen
   free(data);
   data = nullptr;
-  //DEBUG_PRINTLN("deallocateData() called free().");
+  //USER_PRINTF("Segment::deallocateData: free'd   %d bytes.\n", _dataLen);
   Segment::addUsedSegmentData(-_dataLen);
   _dataLen = 0;
 }
@@ -1656,6 +1670,7 @@ void WS2812FX::finalizeInit(void)
     //#endif
       if (arrSize > 0) Segment::_globalLeds = (CRGB*) malloc(arrSize); // WLEDMM avoid malloc(0)
     if ((Segment::_globalLeds != nullptr) && (arrSize > 0)) memset(Segment::_globalLeds, 0, arrSize); // WLEDMM avoid dereferencing nullptr
+    if ((Segment::_globalLeds == nullptr) && (arrSize > 0)) errorFlag = ERR_LOW_MEM; // WLEDMM raise errorflag
   }
 
   //segments are created in makeAutoSegments();
@@ -2403,7 +2418,10 @@ bool WS2812FX::deserializeMap(uint8_t n) {
     if ((size > 0) && (customMappingTable == nullptr)) { // second try
       DEBUG_PRINTLN("deserializeMap: trying to get fresh memory block.");
       customMappingTable = (uint16_t*) calloc(size, sizeof(uint16_t));
-      if (customMappingTable == nullptr) DEBUG_PRINTLN("deserializeMap: alloc failed!");
+      if (customMappingTable == nullptr) { 
+        DEBUG_PRINTLN("deserializeMap: alloc failed!");
+        errorFlag = ERR_LOW_MEM; // WLEDMM raise errorflag
+      }
     }
     if (customMappingTable != nullptr) customMappingTableSize = size;
   }
diff --git a/wled00/const.h b/wled00/const.h
index fa3ded65..2e155754 100644
--- a/wled00/const.h
+++ b/wled00/const.h
@@ -347,7 +347,9 @@
 #define ERR_OVERTEMP    30  // An attached temperature sensor has measured above threshold temperature (not implemented)
 #define ERR_OVERCURRENT 31  // An attached current sensor has measured a current above the threshold (not implemented)
 #define ERR_UNDERVOLT   32  // An attached voltmeter has measured a voltage below the threshold (not implemented)
-#define ERR_LOW_MEM     33  // low memory (RAM)
+#define ERR_LOW_MEM     33  // WLEDMM: low memory (RAM)
+#define ERR_LOW_SEG_MEM 34  // WLEDMM: low memory (segment data RAM)
+#define ERR_LOW_WS_MEM  35  // WLEDMM: low memory (ws)
 
 // Timer mode types
 #define NL_MODE_SET               0            //After nightlight time elapsed, set to target brightness
diff --git a/wled00/data/index.js b/wled00/data/index.js
index 3ea998e3..2a4b51ba 100644
--- a/wled00/data/index.js
+++ b/wled00/data/index.js
@@ -1968,8 +1968,14 @@ function readState(s,command=false)
 		  errstr = "A filesystem error has occured.";
 		  break;
 		case 33:
-			errstr = "Warning: Low Memory (RAM).";
-			break;
+			errstr = "Low Memory (generic RAM).";
+		  break;
+		case 34:
+			errstr = "Low Memory (effect data).";
+		  break;
+		case 35:
+			errstr = "Low Memory (WS data).";
+		  break;
 		}
 	  showToast('Error ' + s.error + ": " + errstr, true);
 	}
diff --git a/wled00/wled.h b/wled00/wled.h
index 546a1c90..23321384 100644
--- a/wled00/wled.h
+++ b/wled00/wled.h
@@ -8,7 +8,7 @@
  */
 
 // version code in format yymmddb (b = daily build)
-#define VERSION 2404091
+#define VERSION 2404161
 
 // WLEDMM  - you can check for this define in usermods, to only enabled WLEDMM specific code in the "right" fork. Its not defined in AC WLED.
 #define _MoonModules_WLED_
diff --git a/wled00/ws.cpp b/wled00/ws.cpp
index be5e0687..351caad4 100644
--- a/wled00/ws.cpp
+++ b/wled00/ws.cpp
@@ -162,6 +162,7 @@ void sendDataWs(AsyncWebSocketClient * client)
     ws.closeAll(1013); //code 1013 = temporary overload, try again later
     ws.cleanupClients(0); //disconnect all clients to release memory
     ws._cleanBuffers();
+    errorFlag = ERR_LOW_WS_MEM;
     return; //out of memory
   }