diff --git a/packages/grpc-native-core/index.js b/packages/grpc-native-core/index.js
index 30a6ff3c..b7deb73b 100644
--- a/packages/grpc-native-core/index.js
+++ b/packages/grpc-native-core/index.js
@@ -143,6 +143,11 @@ exports.load = function load(filename, format, options) {
   } finally {
     ProtoBuf.convertFieldsToCamelCase = convertFieldsToCamelCaseOriginal;
   }
+
+  if (!builder) {
+    throw new Error('Could not load file "' + filename + '"');
+  }
+
   return loadObject(builder.ns, options);
 };
 
diff --git a/run-tests.bat b/run-tests.bat
index 15914532..81de8d25 100644
--- a/run-tests.bat
+++ b/run-tests.bat
@@ -39,6 +39,8 @@ for %%v in (4 6 7 8) do (
   mkdir reports\node%%v
   SET JUNIT_REPORT_PATH=reports/node%%v
 
+  node -e "process.exit(process.version.startsWith('v%%v') ? 0 : -1)" || goto :error
+
   call .\node_modules\.bin\gulp clean.all || SET FAILED=1
   call .\node_modules\.bin\gulp setup.windows || SET FAILED=1
   call .\node_modules\.bin\gulp native.test || SET FAILED=1
diff --git a/run-tests.sh b/run-tests.sh
index 5df88186..1444158b 100755
--- a/run-tests.sh
+++ b/run-tests.sh
@@ -53,6 +53,8 @@ do
 
   mkdir -p "reports/node$version"
 
+  node -e 'process.exit(process.version.startsWith("v'$version'") ? 0 : -1)'
+
   # Install dependencies and link packages together.
   ./node_modules/.bin/gulp clean.all
   ./node_modules/.bin/gulp setup