diff --git a/Cargo.lock b/Cargo.lock
index f1b7f5a..0282664 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -87,7 +87,7 @@ dependencies = [
 
 [[package]]
 name = "buildj"
-version = "0.1.5"
+version = "0.1.6"
 dependencies = [
  "dirs 3.0.1",
  "json",
diff --git a/Cargo.toml b/Cargo.toml
index db1639d..44340c3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "buildj"
-version = "0.1.5"
+version = "0.1.6"
 authors = ["Hatter Jiang <jht5945@gmail.com>"]
 edition = "2018"
 homepage = "https://buildj.ruststack.org/"
diff --git a/build.rs b/build.rs
index 561c0de..aba10c2 100644
--- a/build.rs
+++ b/build.rs
@@ -2,7 +2,10 @@ use std::process::Command;
 
 fn main() {
     let output = Command::new("git").args(&["rev-parse", "HEAD"]).output().unwrap();
-    let git_hash = String::from_utf8(output.stdout).unwrap();
+    let mut git_hash = String::from_utf8(output.stdout).unwrap();
+    if git_hash.is_empty() {
+        git_hash = "0000000000000000000000000000000000000000".to_string();
+    }
     println!("cargo:rustc-env=GIT_HASH={}", git_hash);
     let date_output = Command::new("date").args(&["+%Y-%m-%dT%H:%M:%S%z"]).output().unwrap();
     let date = String::from_utf8(date_output.stdout).unwrap();