diff --git a/wled00/bus_manager.h b/wled00/bus_manager.h
index b0838ae75..ab3156ff4 100644
--- a/wled00/bus_manager.h
+++ b/wled00/bus_manager.h
@@ -91,7 +91,7 @@ class Bus {
     virtual void     setBrightness(uint8_t b) {}
     virtual void     cleanup() {}
     virtual uint8_t  getPins(uint8_t* pinArray) { return 0; }
-    inline  uint16_t getLength() { return _len; }
+    virtual uint16_t getLength() { return _len; }
     virtual void     setColorOrder() {}
     virtual uint8_t  getColorOrder() { return COL_ORDER_RGB; }
     virtual uint8_t  skippedLeds() { return 0; }
@@ -220,7 +220,7 @@ class BusDigital : public Bus {
     return _colorOrder;
   }
 
-  inline uint16_t getLength() {
+  uint16_t getLength() {
     return _len - _skip;
   }
 
diff --git a/wled00/presets.cpp b/wled00/presets.cpp
index 2d783f1c5..de82c939a 100644
--- a/wled00/presets.cpp
+++ b/wled00/presets.cpp
@@ -10,7 +10,15 @@ bool applyPreset(byte index, byte callMode)
 
   const char *filename = index < 255 ? "/presets.json" : "/tmp.json";
 
-  if (fileDoc) {
+	uint8_t core = 1;
+	//crude way to determine if this was called by a network request
+	#ifdef ARDUINO_ARCH_ESP32
+	core = xPortGetCoreID();
+	#endif
+
+	//only allow use of fileDoc from the core responsible for network requests
+	//do not use active network request doc from preset called by main loop (playlist, schedule, ...)
+  if (fileDoc && core) {
     errorFlag = readObjectFromFileUsingId(filename, index, fileDoc) ? ERR_NONE : ERR_FS_PLOAD;
     JsonObject fdo = fileDoc->as<JsonObject>();
     if (fdo["ps"] == index) fdo.remove("ps"); //remove load request for same presets to prevent recursive crash