fix failing test

test/solidity/localsTests/helper.js

@@ -5,18 +5,22 @@ var localDecoder = require('../../../babelify-src/solidity/localDecoder')
   Decode local variable
 */
 function decodeLocal (st, index, traceManager, callTree, verifier) {
-  traceManager.waterfall([
-    traceManager.getStackAt,
-    traceManager.getMemoryAt],
-    index,
-    function (error, result) {
-      if (!error) {
-        var locals = localDecoder.solidityLocals(index, callTree, result[0].value, result[1].value)
-        verifier(locals)
-      } else {
-        st.fail(error)
-      }
-    })
+  try {
+    traceManager.waterfall([
+      traceManager.getStackAt,
+      traceManager.getMemoryAt],
+      index,
+      function (error, result) {
+        if (!error) {
+          var locals = localDecoder.solidityLocals(index, callTree, result[0].value, result[1].value)
+          verifier(locals)
+        } else {
+          st.fail(error)
+        }
+      })
+  } catch (e) {
+    st.fail(e.message)
+  }
 }
 
 module.exports = {