diff --git a/wled00/FX_fcn.cpp b/wled00/FX_fcn.cpp
index b3b9cc54..879b93a2 100644
--- a/wled00/FX_fcn.cpp
+++ b/wled00/FX_fcn.cpp
@@ -2052,6 +2052,7 @@ void WS2812FX::estimateCurrentAndLimitBri() {
 
   for (uint_fast8_t bNum = 0; bNum < busses.getNumBusses(); bNum++) {
     Bus *bus = busses.getBus(bNum);
+    if (!bus || !bus->isOk()) continue;    // WLEDMM skip busses that are not initialized yet
     auto btype = bus->getType();
     if (EXCLUDE_FROM_ABL(btype)) continue; // WLEDMM exclude non-ABL and network busses
     uint16_t len = bus->getLength();
diff --git a/wled00/cfg.cpp b/wled00/cfg.cpp
index 069b303a..6a6849bd 100644
--- a/wled00/cfg.cpp
+++ b/wled00/cfg.cpp
@@ -817,7 +817,7 @@ void serializeConfig() {
 
   for (uint8_t s = 0; s < busses.getNumBusses(); s++) {
     Bus *bus = busses.getBus(s);
-    if (!bus || bus->getLength()==0) break;
+    if (!bus || !bus->isOk() || bus->getLength()==0) break;       // WLEDMM exclude not initialized busses
     JsonObject ins = hw_led_ins.createNestedObject();
     ins["start"] = bus->getStart();
     ins["len"] = bus->getLength();