diff --git a/package.json b/package.json
index 35ac6f0..8b27de7 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,7 @@
     "examples:start-multiple": "run-p start:main-multiple start:react15 start:vue",
     "install:main": "cd examples/main && yarn",
     "start:main": "cd examples/main && yarn start",
-    "start:main-multiple": "cd examples/main && yarn start:multiple",
+    "start-main-multiple": "cd examples/main && yarn start:multiple",
     "install:react16": "cd examples/react16 && yarn",
     "start:react16": "cd examples/react16 && yarn start",
     "install:react15": "cd examples/react15 && yarn",
diff --git a/src/sandbox/proxySandbox.ts b/src/sandbox/proxySandbox.ts
index e2c0aa3..2c968ac 100644
--- a/src/sandbox/proxySandbox.ts
+++ b/src/sandbox/proxySandbox.ts
@@ -331,5 +331,7 @@ export default class ProxySandbox implements SandBox {
     });
 
     this.proxy = proxy;
+
+    activeSandboxCount++;
   }
 }