1 files changed, 4 insertions, 2 deletions
diff --git a/emscripten.py b/emscripten.py
index 0fa6ac30..6d384a96 100755
--- a/emscripten.py
+++ b/emscripten.py
@@ -514,8 +514,10 @@ var asm = (function(global, env, buffer) {
   function setThrew(threw, value) {
     threw = threw|0;
     value = value|0;
-    __THREW__ = threw;
-    threwValue = value;
+    if ((__THREW__|0) == 0) {
+      __THREW__ = threw;
+      threwValue = value;
+    }
   }
 ''' + ''.join(['''
   function setTempRet%d(value) {