--- main.c.orig	2008-09-05 18:52:07 +0400
+++ main.c	2008-09-05 18:52:54 +0400
@@ -701,6 +701,11 @@
 		if(!strncmp(argv[i], "-l", 3)){
 			if(++i < argc) {
 				dzen.slave_win.max_lines = atoi(argv[i]);
+
+				if (dzen.slave_win.max_lines<1) {
+					dzen.slave_win.max_lines=1;
+				}
+
 				init_input_buffer();
 			}
 		}