Index: trunk/src_plugins/lib_hid_pcbui/act.c
===================================================================
--- trunk/src_plugins/lib_hid_pcbui/act.c	(revision 29945)
+++ trunk/src_plugins/lib_hid_pcbui/act.c	(revision 29946)
@@ -297,7 +297,7 @@
 	args[3].type = FGW_STR; args[3].val.cstr = title;
 	er = pcb_actionv_bin(PCB_ACT_HIDLIB, "promptfor", &r, 4, args);
 
-	if ((er != NULL) || ((r.type & FGW_STR) != FGW_STR)) {
+	if ((er != 0) || ((r.type & FGW_STR) != FGW_STR)) {
 		fgw_arg_free(&pcb_fgw, &r);
 		PCB_ACT_IRES(1);
 		return 0;