From ed20a67a1268bf517cfdbc1a897b659dce38f3a4 Mon Sep 17 00:00:00 2001
From: Ziv Scully <ziv@mit.edu>
Date: Thu, 12 Nov 2015 10:06:07 -0500
Subject: Initialize invalidation to NULL!

---
 src/c/urweb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/c/urweb.c b/src/c/urweb.c
index 050a06c9..55d89fd5 100644
--- a/src/c/urweb.c
+++ b/src/c/urweb.c
@@ -585,6 +585,7 @@ uw_context uw_init(int id, uw_loggers *lg) {
 
   ctx->numRecording = 0;
   ctx->recordingOffset = 0;
+  ctx->inval = NULL;
 
   ctx->remoteSock = -1;
 
@@ -4732,9 +4733,11 @@ void uw_Sqlcache_flush(uw_context ctx, uw_Sqlcache_Cache *cache, char **keys) {
   inval->keys = keys;
   inval->next = NULL;
   if (ctx->inval) {
+    // An invalidation is already registered, so just extend it.
     ctx->inval->next = inval;
   } else {
     uw_register_transactional(ctx, inval, uw_Sqlcache_flushCommit, NULL, uw_Sqlcache_flushFree);
   }
+  // [ctx->inval] should always point to the last invalidation.
   ctx->inval = inval;
 }
-- 
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