diff --git a/gcc/lto-cgraph.c b/gcc/lto-cgraph.c
index b82fa73..b61e5d1 100644
--- a/gcc/lto-cgraph.c
+++ b/gcc/lto-cgraph.c
@@ -1468,6 +1468,8 @@ input_cgraph (void)
 
       ib = lto_create_simple_input_block (file_data, LTO_section_cgraph,
 					  &data, &len);
+      if (!ib) 
+	fatal_error ("Cannot find LTO cgraph in %s\n", file_data->file_name);
       input_profile_summary (ib);
       file_data->cgraph_node_encoder = lto_cgraph_encoder_new ();
       nodes = input_cgraph_1 (file_data, ib);
@@ -1476,12 +1478,16 @@ input_cgraph (void)
 
       ib = lto_create_simple_input_block (file_data, LTO_section_varpool,
 					  &data, &len);
+      if (!ib)
+	fatal_error ("Cannot find LTO varpool in %s\n", file_data->file_name);
       varpool = input_varpool_1 (file_data, ib);
       lto_destroy_simple_input_block (file_data, LTO_section_varpool,
 				      ib, data, len);
 
       ib = lto_create_simple_input_block (file_data, LTO_section_refs,
 					  &data, &len);
+      if (!ib)
+	fatal_error("Cannot find LTO section refs in %s\n", file_data->file_name);
       input_refs (ib, nodes, varpool);
       lto_destroy_simple_input_block (file_data, LTO_section_refs,
 				      ib, data, len);
diff --git a/gcc/lto/lto.c b/gcc/lto/lto.c
index e2fa975..2fbea73 100644
--- a/gcc/lto/lto.c
+++ b/gcc/lto/lto.c
@@ -493,7 +493,11 @@ lto_file_finalize (struct lto_file_decl_data *file_data, lto_file *file)
   file_data->renaming_hash_table = lto_create_renaming_table ();
   file_data->file_name = file->filename;
   data = lto_get_section_data (file_data, LTO_section_decls, NULL, &len);
-  gcc_assert (data != NULL);
+  if (data == NULL)
+    {
+      internal_error ("Cannot read LTO decls from %s", file_data->file_name);
+      return;
+    }
   lto_read_decls (file_data, data, file_data->resolutions);
   lto_free_section_data (file_data, LTO_section_decls, NULL, data, len);
 }