Index: src_plugins/shape/shape.c
===================================================================
--- src_plugins/shape/shape.c	(revision 18910)
+++ src_plugins/shape/shape.c	(revision 18911)
@@ -294,6 +294,9 @@
 	char *end;
 	pcb_bool succ;
 
+	if (arg == NULL)
+		return pcb_false;
+
 	dst = arg;
 	end = strchr(dst, ';');
 	if (end != NULL) {