diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2c58669..c8eb6b3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -56,8 +56,9 @@ add_executable(copasijs src/copasijs.cpp src/copasijs.h src/)
 target_link_libraries(copasijs PUBLIC embind)
 set(CMAKE_EXECUTABLE_SUFFIX ".js")
 
-set(COPASIJS_OPT_FLAGS "-Os")
-# set(COPASIJS_OPT_FLAGS "-O3")
+set(COPASIJS_OPT_FLAGS "-Os -sNO_DISABLE_EXCEPTION_CATCHING -fexceptions")
+# set(COPASIJS_OPT_FLAGS "-O3 -g -sASSERTIONS=2 -sNO_DISABLE_EXCEPTION_CATCHING -fexceptions")
+
 
 set (WASM_FILE)
 if (COPASIJS_SINGLE_FILE)
diff --git a/dev/em-web.sh b/dev/em-web.sh
new file mode 100755
index 0000000..b9c9e33
--- /dev/null
+++ b/dev/em-web.sh
@@ -0,0 +1,21 @@
+
+INSTALL_PREFIX=dist-web
+export export ENVIRONMENT="web"
+rm -rf $INSTALL_PREFIX
+
+
+# execute the build script
+./dev/em-build.sh
+
+
+# copy the example files
+cp examples/node/*.js $INSTALL_PREFIX
+
+# copy test files
+cp test/*.js $INSTALL_PREFIX
+
+# run tests
+cd $INSTALL_PREFIX
+node test_node.js ../example_files/oscli.xml
+
+ls -l .
\ No newline at end of file
diff --git a/examples/vue-copasi-ts/src/views/HomeView.vue b/examples/vue-copasi-ts/src/views/HomeView.vue
index 3e59982..0228a14 100644
--- a/examples/vue-copasi-ts/src/views/HomeView.vue
+++ b/examples/vue-copasi-ts/src/views/HomeView.vue
@@ -57,11 +57,17 @@ onMounted(async () => {
 
 <template>
   <main>
+    <div v-if="data == null">
+      <p>loading...</p>
+    </div>
+    
+    <div v-else>
     <VuePlotly :data="data" :layout="layout" :display-mode-bar="false"></VuePlotly>
     <div>
       <p>Model: {{ info?.model.name }}</p>
       <p >COPASI Version: {{copasi?.version}}</p>
     </div>
+    </div>
   </main>
 </template>