diff --git a/src/backend/utils/adt/arrayfuncs.c b/src/backend/utils/adt/arrayfuncs.c
index bc2f30bae15..660e854e93f 100644
--- a/src/backend/utils/adt/arrayfuncs.c
+++ b/src/backend/utils/adt/arrayfuncs.c
@@ -3992,13 +3992,14 @@ hash_array(PG_FUNCTION_ARGS)
 			MemoryContext oldcontext;
 			TypeCacheEntry *record_typentry;
 
-			oldcontext = MemoryContextSwitchTo(CacheMemoryContext);
+			oldcontext = MemoryContextSwitchTo(fcinfo->flinfo->fn_mcxt);
 
 			/*
 			 * Make fake type cache entry structure.  Note that we can't just
 			 * modify typentry, since that points directly into the type cache.
 			 */
-			record_typentry = palloc(sizeof(*record_typentry));
+			record_typentry = palloc0(sizeof(*record_typentry));
+			record_typentry->type_id = element_type;
 
 			/* fill in what we need below */
 			record_typentry->typlen = typentry->typlen;