diff --git a/lib/efi_loader/efi_console.c b/lib/efi_loader/efi_console.c
index 909fd5c..b2cb18e 100644
--- a/lib/efi_loader/efi_console.c
+++ b/lib/efi_loader/efi_console.c
@@ -136,6 +136,11 @@
 
 	EFI_ENTRY("%p, %p", this, string);
 
+	if (!this || !string) {
+		ret = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+
 	buf = malloc(utf16_utf8_strlen(string) + 1);
 	if (!buf) {
 		ret = EFI_OUT_OF_RESOURCES;