Index: src/layer_grp.c
===================================================================
--- src/layer_grp.c	(revision 8644)
+++ src/layer_grp.c	(revision 8645)
@@ -615,7 +615,7 @@
 {
 	pcb_layergrp_id_t n;
 	for (n = 0; n < pcb->LayerGroups.len; n++)
-		if (strcmp(PCB->LayerGroups.grp[n].name, name) == 0)
+		if ((PCB->LayerGroups.grp[n].name != NULL) && (strcmp(PCB->LayerGroups.grp[n].name, name) == 0))
 			return n;
 	return -1;
 }