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-rw-r--r--builtin/merge.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/builtin/merge.c b/builtin/merge.c
index a068660d09..c371484ab6 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -1030,7 +1030,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
branch = resolve_ref("HEAD", head, 0, &flag);
if (branch && !prefixcmp(branch, "refs/heads/"))
branch += 11;
- if (is_null_sha1(head))
+ if (!branch || is_null_sha1(head))
head_invalid = 1;
git_config(git_merge_config, NULL);