diff --git a/Cargo.toml b/Cargo.toml
index 7096d77..8e662eb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "sm4-gcm"
-version = "0.1.1"
+version = "0.1.2"
 edition = "2021"
 authors = ["Hatter Jiang"]
 repository = "https://git.hatter.ink/hatter/sm4-gcm"
diff --git a/src/decryptor.rs b/src/decryptor.rs
index 3c99890..de1f80f 100644
--- a/src/decryptor.rs
+++ b/src/decryptor.rs
@@ -123,6 +123,9 @@ impl Sm4GcmStreamDecryptor {
         self.ghash.update_padded(&adata_and_message_len);
 
         let tag = self.calculate_tag();
+        if self.message_buffer.len() < 16 {
+            return Err(format!("Tag missing, message length is: {} < 16 bytes", self.message_buffer.len()));
+        }
         let message_tag = &self.message_buffer[message_buffer_len - 16..];
 
         if message_tag != tag.as_slice() {