diff --git a/Marlin/src/core/serial.cpp b/Marlin/src/core/serial.cpp
index 77854d0f80a264aaaa30df3aabd09179affc7932..0d22f7bfc067a2ff6a8771dfc23c63ed5bd6ce48 100644
--- a/Marlin/src/core/serial.cpp
+++ b/Marlin/src/core/serial.cpp
@@ -68,7 +68,7 @@ void print_bin(uint16_t val) {
 extern const char SP_X_STR[], SP_Y_STR[], SP_Z_STR[];
 
 void print_xyz(const float &x, const float &y, const float &z, PGM_P const prefix/*=nullptr*/, PGM_P const suffix/*=nullptr*/) {
-  serialprintPGM(prefix);
+  if (prefix) serialprintPGM(prefix);
   SERIAL_ECHOPAIR_P(SP_X_STR, x, SP_Y_STR, y, SP_Z_STR, z);
   if (suffix) serialprintPGM(suffix); else SERIAL_EOL();
 }