thodg/libgit2

diff --git a/src/worktree.c b/src/worktree.c
index fda9b0b..5b1e279 100644
--- a/src/worktree.c
+++ b/src/worktree.c
@@ -259,7 +259,14 @@ int git_worktree_validate(const git_worktree *wt)
 			wt->commondir_path);
 		return GIT_ERROR;
 	}
-
+	
+	if (!git_path_exists(wt->worktree_path)) {
+		git_error_set(GIT_ERROR_WORKTREE,
+			"worktree directory '%s' does not exist",
+			wt->worktree_path);
+		return GIT_ERROR;
+	}
+	
 	return 0;
 }
 
diff --git a/tests/worktree/worktree.c b/tests/worktree/worktree.c
index cd20bed..f2078a3 100644
--- a/tests/worktree/worktree.c
+++ b/tests/worktree/worktree.c
@@ -610,3 +610,15 @@ void test_worktree_worktree__foreach_worktree_lists_all_worktrees(void)
 	int counter = 0;
 	cl_git_pass(git_repository_foreach_worktree(fixture.repo, foreach_worktree_cb, &counter));
 }
+
+void test_worktree_worktree__validate_invalid_worktreedir(void)
+{
+	git_worktree *wt;
+
+	cl_git_pass(git_worktree_lookup(&wt, fixture.repo, "testrepo-worktree"));
+	p_rename("testrepo-worktree", "testrepo-worktree-tmp");
+	cl_git_fail(git_worktree_validate(wt));
+	p_rename("testrepo-worktree-tmp", "testrepo-worktree");
+
+	git_worktree_free(wt);
+}