diff --git a/packages/compiler/Cargo.toml b/packages/compiler/Cargo.toml
index 42eb6cc..c51224b 100644
--- a/packages/compiler/Cargo.toml
+++ b/packages/compiler/Cargo.toml
@@ -36,3 +36,4 @@ regex = "=1.10.6"
 getrandom = { version = "0.2", features = ["js"] }
 wasm-bindgen = "0.2"
 serde-wasm-bindgen = "0.6.5"
+console_error_panic_hook = "0.1.7"
diff --git a/packages/compiler/src/lib.rs b/packages/compiler/src/lib.rs
index 2767c52..ad03986 100644
--- a/packages/compiler/src/lib.rs
+++ b/packages/compiler/src/lib.rs
@@ -216,5 +216,6 @@ pub fn gen_circom_from_decomposed_regex(
     Ok(())
 }
 
+// do not re-define
 #[cfg(target_arch = "wasm32")]
 pub use crate::wasm::*;
diff --git a/packages/compiler/src/wasm.rs b/packages/compiler/src/wasm.rs
index 742bbdc..81713a3 100644
--- a/packages/compiler/src/wasm.rs
+++ b/packages/compiler/src/wasm.rs
@@ -1,4 +1,5 @@
 use crate::*;
+use console_error_panic_hook;
 use serde_wasm_bindgen::from_value;
 use wasm_bindgen::prelude::*;
 
@@ -7,6 +8,7 @@ use self::circom::gen_circom_string;
 #[wasm_bindgen]
 #[allow(non_snake_case)]
 pub fn genFromDecomposed(decomposedRegexJson: &str, circomTemplateName: &str) -> String {
+    console_error_panic_hook::set_once();
     let mut decomposed_regex_config: DecomposedRegexConfig =
         serde_json::from_str(decomposedRegexJson).expect("failed to parse decomposed_regex json");
     let regex_and_dfa = get_regex_and_dfa(&mut decomposed_regex_config)