Check for a null srvdll in sst_dbg_sendtables

Avoids crashing if we couldn't get the interface for whatever reason.
Apparently bill ran into such a case.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/dbg.c b/src/dbg.c
index 17e88a0..180c686 100644
--- a/src/dbg.c
+++ b/src/dbg.c
@@ -127,6 +127,10 @@ static void dumptable(struct SendTable *st, int indent) {
 	}
 }
 DEF_CCMD_HERE(sst_dbg_sendtables, "Dump ServerClass/SendTable hierarchy", 0) {
+	if (!srvdll) {
+		errmsg_errorx("can't iterate ServerClass list: missing srvdll global");
+		return;
+	}
 	for (struct ServerClass *class = GetAllServerClasses(srvdll); class;
 			class = class->next) {
 		struct SendTable *st = class->table;