diff --git a/wled00/FX.h b/wled00/FX.h
index 0b871c52..f3205e9c 100644
--- a/wled00/FX.h
+++ b/wled00/FX.h
@@ -368,7 +368,7 @@ typedef struct Segment {
     byte* data;
     CRGB* leds;
     static CRGB *_globalLeds;
-    void *jMapC; //WLEDSR jMap
+    void *jMap; //WLEDSR jMap
 
   private:
     union {
@@ -478,8 +478,6 @@ typedef struct Segment {
       if (!Segment::_globalLeds && leds) free(leds);
       if (name) delete[] name;
       if (_t) delete _t;
-    Serial.println("~Segment");  //WLEDSR jMap
-      // deletejMap();
       deallocateData();
     }
 
@@ -535,7 +533,7 @@ typedef struct Segment {
     CRGBPalette16 &currentPalette(CRGBPalette16 &tgt, uint8_t paletteID);
 
     // 1D strip
-    uint16_t virtualLength(void); //WLEDSR jMap: without const
+    uint16_t virtualLength(void) const;
     void setPixelColor(int n, uint32_t c); // set relative pixel within segment with color
     void setPixelColor(int n, byte r, byte g, byte b, byte w = 0) { setPixelColor(n, RGBW32(r,g,b,w)); } // automatically inline
     void setPixelColor(int n, CRGB c)                             { setPixelColor(n, RGBW32(c.r,c.g,c.b,0)); } // automatically inline
@@ -562,7 +560,7 @@ typedef struct Segment {
     uint16_t virtualWidth(void)  const;
     uint16_t virtualHeight(void) const;
     uint16_t nrOfVStrips(void) const;
-    void *getjMap(); //WLEDSR jMap
+    void createjMap(); //WLEDSR jMap
     void deletejMap(); //WLEDSR jMap
   #ifndef WLED_DISABLE_2D
     uint16_t XY(uint16_t x, uint16_t y); // support function to get relative index within segment (for leds[])
diff --git a/wled00/FX_fcn.cpp b/wled00/FX_fcn.cpp
index 353e58b8..ed6bcad4 100644
--- a/wled00/FX_fcn.cpp
+++ b/wled00/FX_fcn.cpp
@@ -437,14 +437,14 @@ class JMapC {
       }
     }
     uint16_t length() {
-      initjMapDoc();
+      updatejMapDoc();
       if (jMapDoc)
         return jMapDoc->size();
       else
         return SEGMENT.virtualWidth() * SEGMENT.virtualHeight(); //pixels
     }
     void setPixelColor(uint16_t i, uint32_t col) {
-      initjMapDoc();
+      updatejMapDoc();
       if (jMapDoc) {
         if (i==0) {
           SEGMENT.fadeToBlackBy(10); //as not all pixels used
@@ -463,7 +463,7 @@ class JMapC {
       }
     }
     uint32_t getPixelColor(uint16_t i) {
-      initjMapDoc();
+      updatejMapDoc();
       if (jMapDoc) {
         JsonArray outerArray = jMapDoc->as<JsonArray>();
         if (outerArray[i][0].is<JsonArray>())
@@ -476,14 +476,15 @@ class JMapC {
   private:
     DynamicJsonDocument *jMapDoc = nullptr;
     uint8_t scale;
-    void initjMapDoc() {
-      // if (jMapDoc && SEGMENT.name == nullptr) {
-      //   Serial.println("Delete jMapDoc");
-      //   delete jMapDoc; jMapDoc = nullptr;
-      // }
-      if (!jMapDoc && SEGMENT.name != nullptr) {
+    void updatejMapDoc() {
+      if (jMapDoc && SEGMENT.name == nullptr) {
+        Serial.println("Delete jMapDoc");
+        delete jMapDoc; jMapDoc = nullptr;
+      }
+
+      if (!jMapDoc && SEGMENT.name != nullptr && SEGMENT.map1D2D == M12_jMap) {
         Serial.println("Create jMapDoc");
-        jMapDoc = new DynamicJsonDocument(4*4096);
+        jMapDoc = new DynamicJsonDocument(5*4096);
       }
 
       if (jMapDoc && SEGMENT.name != nullptr && strcmp(SEGMENT.name, previousSegmentName) != 0) {
@@ -499,7 +500,7 @@ class JMapC {
         if (err) 
         {
           Serial.printf("deserializeJson() of parseTree failed with code %s\n", err.c_str());
-          SEGMENT.name = nullptr; //need to clear the name as otherwise continuously loaded
+          delete[] SEGMENT.name; SEGMENT.name = nullptr; //need to clear the name as otherwise continuously loaded
           return;
         }
         //get the width and height of the jMap
@@ -526,29 +527,28 @@ class JMapC {
         // serializeJson(*jMapDoc, Serial); Serial.println();
         strcpy(previousSegmentName, SEGMENT.name);
       }
-    } //initjMapDoc
+    } //updatejMapDoc
 }; //class JMapC
 
 //WLEDSR jMap
-void * Segment::getjMap() {
-  if (!jMapC) {
-    Serial.println("getjMap");
-    jMapC = new JMapC();
+void Segment::createjMap() {
+  if (!jMap) {
+    Serial.println("createjMap");
+    jMap = new JMapC();
   }
-  return jMapC;
 }
 
 //WLEDSR jMap
 void Segment::deletejMap() {
   //Should be called from ~Segment but causes crash (and ~Segment is called quite often...)
-  if (jMapC) {
+  if (jMap) {
     Serial.println("deletejMap");
-    delete (JMapC *)jMapC; jMapC = nullptr;
+    delete (JMapC *)jMap; jMap = nullptr;
   }
 }
 
 // 1D strip
-uint16_t Segment::virtualLength() { //WLEDSR jMap: without const
+uint16_t Segment::virtualLength() const {
 #ifndef WLED_DISABLE_2D
   if (is2D()) {
     uint16_t vW = virtualWidth();
@@ -563,8 +563,8 @@ uint16_t Segment::virtualLength() { //WLEDSR jMap: without const
         vLen = max(vW,vH); // get the longest dimension
         break;
       case M12_jMap: //WLEDSR jMap
-        JMapC *jMapC = (JMapC *)getjMap();
-        vLen = jMapC->length();
+        if (jMap)
+          vLen = ((JMapC *)jMap)->length();
         break;
     }
     return vLen;
@@ -609,8 +609,8 @@ void IRAM_ATTR Segment::setPixelColor(int i, uint32_t col)
         for (int y = 0; y <  i; y++) setPixelColorXY(i, y, col);
         break;
       case M12_jMap: //WLEDSR jMap
-        JMapC *jMapC = (JMapC *)getjMap();
-        jMapC->setPixelColor(i, col);
+        if (jMap)
+          ((JMapC *)jMap)->setPixelColor(i, col);
         break;
     }
     return;
@@ -719,8 +719,8 @@ uint32_t Segment::getPixelColor(int i)
         return vW>vH ? getPixelColorXY(i, 0) : getPixelColorXY(0, i);
         break;
       case M12_jMap: //WLEDSR jMap
-        JMapC *jMapC = (JMapC *)getjMap();
-        return jMapC->getPixelColor(i);
+        if (jMap)
+          return ((JMapC *)jMap)->getPixelColor(i);
         break;
     }
     return 0;
diff --git a/wled00/json.cpp b/wled00/json.cpp
index 77bfef8b..601a4508 100644
--- a/wled00/json.cpp
+++ b/wled00/json.cpp
@@ -82,6 +82,12 @@ void deserializeSegment(JsonObject elem, byte it, byte presetId)
   uint8_t  soundSim = elem["ssim"] | seg.soundSim;
   uint8_t  map1D2D  = elem["mp12"] | seg.map1D2D;
 
+  //WLEDSR jMap
+  if (map1D2D == M12_jMap && !seg.jMap)
+    seg.createjMap();
+  if (map1D2D != M12_jMap && seg.jMap)
+    seg.deletejMap();
+
   if ((spc>0 && spc!=seg.spacing) || seg.map1D2D!=map1D2D) seg.fill(BLACK); // clear spacing gaps
 
   seg.map1D2D  = constrain(map1D2D, 0, 7);