diff --git a/wled00/wled.cpp b/wled00/wled.cpp
index ee089439..2294ea7c 100644
--- a/wled00/wled.cpp
+++ b/wled00/wled.cpp
@@ -193,7 +193,9 @@ void WLED::loop()
     #endif
     #ifdef WLED_DEBUG
     stripMillis = millis() - stripMillis;
+    #ifndef WLED_DEBUG_HEAP  // WLEDMM heap debug messages take some time - this warning is popping in too often
     if (stripMillis > 50) DEBUG_PRINTLN("Slow strip.");
+    #endif
     avgStripMillis += stripMillis;
     if (stripMillis > maxStripMillis) maxStripMillis = stripMillis;
     #endif
diff --git a/wled00/wled00.ino b/wled00/wled00.ino
index dd316dae..056d8f28 100644
--- a/wled00/wled00.ino
+++ b/wled00/wled00.ino
@@ -47,7 +47,7 @@ void esp_heap_trace_free_hook(void* ptr)
     Serial.println("** free: attempt to free nullptr."); 
   } else {
     size_t blocksize = heap_caps_get_allocated_size(ptr);
-    if (blocksize > 256000)
+    if ((blocksize < 1) || (blocksize > 256000))
       Serial.println("**** free: bad pointer to " + String(blocksize) + "bytes.");
     else
       Serial.println("** free " + String(blocksize) + "bytes.");