tree-diff: don't access hash of NULL object_id pointer

diff --git a/Makefile b/Makefile
index e35542e63181144397053bf7932fad2cf97027bb..2ed6db728a8479adf7df76d1525a50733fa013ae 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -842,6 +842,7 @@ LIB_OBJS += streaming.o
 LIB_OBJS += string-list.o
 LIB_OBJS += submodule.o
 LIB_OBJS += submodule-config.o
+LIB_OBJS += sub-process.o
 LIB_OBJS += symlinks.o
 LIB_OBJS += tag.o
 LIB_OBJS += tempfile.o