Follow-up to r17370 - Fix map crash when private messaging an autotrade character - Fixes bugreport:7755

git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@17378 54d463be-8e91-2dee-dedb-b68131a5f0ec

src/map/clif.c

@@ -5773,7 +5773,7 @@ void clif_wis_message(int fd, const char* nick, const char* mes, int mes_len)
 	WFIFOW(fd,0) = 0x97;
 	WFIFOW(fd,2) = mes_len + NAME_LENGTH + 8;
 	safestrncpy((char*)WFIFOP(fd,4), nick, NAME_LENGTH);
-	WFIFOL(fd,28) = (pc_get_group_level(ssd) == 99) ? 1 : 0; // isAdmin; if nonzero, also displays text above char
+	WFIFOL(fd,28) = (ssd && pc_get_group_level(ssd) == 99) ? 1 : 0; // isAdmin; if nonzero, also displays text above char
 	safestrncpy((char*)WFIFOP(fd,32), mes, mes_len);
 	WFIFOSET(fd,WFIFOW(fd,2));
 #endif