Index: write.c
===================================================================
--- write.c	(revision 9751)
+++ write.c	(revision 9752)
@@ -56,6 +56,11 @@
 {
 	/*fputs("io_kicad_legacy_write_buffer()", FP); */
 
+	if (elementlist_length(&buff->Data->Element) == 0) {
+		pcb_message(PCB_MSG_ERROR, "Buffer has no elements!\n");
+		return -1;
+	}
+
 	fputs("PCBNEW-LibModule-V1	jan 01 jan 2016 00:00:01 CET\n",FP);
 	fputs("Units mm\n",FP);
 	fputs("$INDEX\n",FP);