--- a/src/signs.cpp	Wed Aug 13 06:05:01 2008 +0000
+++ b/src/signs.cpp	Wed Aug 13 06:22:04 2008 +0000
@@ -133,6 +133,8 @@
 	/* If _cmd_text 0 means the new text for the sign is non-empty.
 	 * So rename the sign. If it is empty, it has no name, so delete it */
 	if (!StrEmpty(_cmd_text)) {
+		if (strlen(_cmd_text) >= MAX_LENGTH_SIGN_NAME_BYTES) return CMD_ERROR;
+
 		if (flags & DC_EXEC) {
 			Sign *si = GetSign(p1);