thodg/libgit2

diff --git a/src/revparse.c b/src/revparse.c
index 4d6ffb5..0c053b3 100644
--- a/src/revparse.c
+++ b/src/revparse.c
@@ -406,7 +406,7 @@ static int handle_caret_syntax(git_object **out, git_repository *repo, git_objec
          *out = newobj2;
          return 0;
       }
-      
+
       /* {/...} -> Walk all commits until we see a commit msg that matches the phrase. */
       if (movement[1] == '/') {
          int retcode = GIT_ERROR;
@@ -550,6 +550,11 @@ static int oid_for_tree_path(git_oid *out, git_tree *tree, git_repository *repo,
       }
    }
 
+   if (!entry) {
+      giterr_set(GITERR_INVALID, "Invalid tree path '%s'", path);
+      return GIT_ERROR;
+   }
+
    git_oid_cpy(out, git_tree_entry_id(entry));
    git__free(alloc);
    return 0;
diff --git a/tests-clar/refs/revparse.c b/tests-clar/refs/revparse.c
index fda99e9..c303e1b 100644
--- a/tests-clar/refs/revparse.c
+++ b/tests-clar/refs/revparse.c
@@ -163,6 +163,7 @@ void test_refs_revparse__colon(void)
    cl_git_fail(git_revparse_single(&g_obj, g_repo, ":/"));
    cl_git_fail(git_revparse_single(&g_obj, g_repo, ":/not found in any commit"));
    cl_git_fail(git_revparse_single(&g_obj, g_repo, ":2:README"));
+   cl_git_fail(git_revparse_single(&g_obj, g_repo, "master:"));
 
    test_object("subtrees:ab/4.txt", "d6c93164c249c8000205dd4ec5cbca1b516d487f");
    test_object("subtrees:ab/de/fgh/1.txt", "1f67fc4386b2d171e0d21be1c447e12660561f9b");