diff --git a/src/core/lib/transport/static_metadata.c b/src/core/lib/transport/static_metadata.c
index 5adc3216c98d500e556743284776223287a55771..750711befd7ca190b206aeff791140a7b2f58b58 100644
--- a/src/core/lib/transport/static_metadata.c
+++ b/src/core/lib/transport/static_metadata.c
@@ -474,7 +474,7 @@ grpc_mdelem grpc_static_mdelem_for_static_strings(int a, int b) {
   if (a == -1 || b == -1) return GRPC_MDNULL;
   uint32_t k = (uint32_t)(a * 98 + b);
   uint32_t h = elems_phash(k);
-  return elem_keys[h] == k
+  return h < GPR_ARRAY_SIZE(elem_keys) && elem_keys[h] == k
              ? GRPC_MAKE_MDELEM(&grpc_static_mdelem_table[elem_idxs[h]],
                                 GRPC_MDELEM_STORAGE_STATIC)
              : GRPC_MDNULL;
diff --git a/tools/codegen/core/gen_static_metadata.py b/tools/codegen/core/gen_static_metadata.py
index 0374cf75a1a17c548b950d6f71bba83c71fd5572..4703708aaa27e1dab0c9ab165fe60131a93c0268 100755
--- a/tools/codegen/core/gen_static_metadata.py
+++ b/tools/codegen/core/gen_static_metadata.py
@@ -461,7 +461,7 @@ print >>C, 'grpc_mdelem grpc_static_mdelem_for_static_strings(int a, int b) {'
 print >>C, '  if (a == -1 || b == -1) return GRPC_MDNULL;'
 print >>C, '  uint32_t k = (uint32_t)(a * %d + b);' % len(all_strs)
 print >>C, '  uint32_t h = elems_phash(k);'
-print >>C, '  return elem_keys[h] == k ? GRPC_MAKE_MDELEM(&grpc_static_mdelem_table[elem_idxs[h]], GRPC_MDELEM_STORAGE_STATIC) : GRPC_MDNULL;'
+print >>C, '  return h < GPR_ARRAY_SIZE(elem_keys) && elem_keys[h] == k ? GRPC_MAKE_MDELEM(&grpc_static_mdelem_table[elem_idxs[h]], GRPC_MDELEM_STORAGE_STATIC) : GRPC_MDNULL;'
 print >>C, '}'
 print >>C