Apply fix

packages/pg/lib/query.js

@@ -142,7 +142,7 @@ class Query extends EventEmitter {
   // the docs here: https://www.postgresql.org/docs/9.6/protocol-flow.html#PROTOCOL-FLOW-EXT-QUERY
   // say "Therefore, an Execute phase is always terminated by the appearance of exactly one of these messages: CommandComplete, EmptyQueryResponse (if the portal was created from an empty query string), ErrorResponse, or PortalSuspended."
   maybeSync(connection) {
-    if (this.isPreparedStatement) {
+    if (this.isPreparedStatement && !this._hasSentSync) {
       this._hasSentSync = true
       connection.sync()
     }

packages/pg/test/integration/gh-issues/1105-tests.js

@@ -6,7 +6,7 @@ suite.testAsync('timeout causing query crashes', async () => {
   const client = new helper.Client()
   await client.connect()
   await client.query('CREATE TEMP TABLE foobar( name TEXT NOT NULL, id SERIAL)')
-  client.query('BEGIN')
+  await client.query('BEGIN')
   await client.query("SET LOCAL statement_timeout TO '1ms'")
   let count = 0
   while (count++ < 5000) {