Index: line_of_vias.c
===================================================================
--- line_of_vias.c	(revision 28874)
+++ line_of_vias.c	(revision 28875)
@@ -118,10 +118,17 @@
 	pcb_line_t *line;
 	pcb_board_t *pcb = pcb_data_get_top(subc->data);
 	pcb_layer_t *ly = &subc->data->Layer[LID_EDIT];
+	line_of_vias *lov = subc->extobj_data;
 
 	if (subc->extobj_data == NULL)
 		line_of_vias_unpack(subc);
 
+	if (lov->pitch < PCB_MM_TO_COORD(0.001)) {
+		pcb_message(PCB_MSG_ERROR, "line_of_vias_gen(): can not generate line-of-vias, pitch value is too small\n");
+		return -1;
+	}
+
+
 	pcb_exto_regen_begin(subc);
 	for(line = linelist_first(&ly->Line); line != NULL; line = linelist_next(line))
 		line_of_vias_gen_line(pcb, subc, line);