diff --git a/variants/esp32p4/crowpanel-advanced-p4/variant.cpp b/variants/esp32p4/crowpanel-advanced-p4/variant.cpp
new file mode 100644
index 000000000..cd089d329
--- /dev/null
+++ b/variants/esp32p4/crowpanel-advanced-p4/variant.cpp
@@ -0,0 +1,15 @@
+#include "variant.h"
+#include "Arduino.h"
+#include <esp32-hal-periman.h>
+
+void earlyInitVariant()
+{
+#if defined(CONFIG_IDF_TARGET_ESP32P4) && defined(BOARD_SDMMC_POWER_PIN)
+    // Work around Arduino-ESP32 P4 SPI null-deref in setLDOPower() when this pin
+    // already has a bus type but no extra type string assigned.
+    if (perimanPinIsValid(BOARD_SDMMC_POWER_PIN) && perimanGetPinBusType(BOARD_SDMMC_POWER_PIN) != ESP32_BUS_TYPE_MAX &&
+        perimanGetPinBusExtraType(BOARD_SDMMC_POWER_PIN) == nullptr) {
+        perimanSetPinBusExtraType(BOARD_SDMMC_POWER_PIN, "");
+    }
+#endif
+}
\ No newline at end of file