diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 0457f446..c08ecb1e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -23,8 +23,6 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - uses: mymindstorm/setup-emsdk@v11
-      with:
-        emsdk-version: 3.1.25
     - name: Compiling
       run: |
         bash build_wasm.sh
diff --git a/src/error.h b/src/error.h
index 6a5c60a0..653cc071 100644
--- a/src/error.h
+++ b/src/error.h
@@ -81,6 +81,6 @@ private:
         return ss.str();
     }
 public:
-    RuntimeError(_Str type, _Str msg, std::stack<_Str> snapshots)
+    RuntimeError(_Str type, _Str msg, const std::stack<_Str>& snapshots)
         : _Error(type, msg, __concat(snapshots)) {}
 };
\ No newline at end of file