diff --git a/src/js/contentscript-end.js b/src/js/contentscript-end.js
index 8d74f04..3b93419 100644
--- a/src/js/contentscript-end.js
+++ b/src/js/contentscript-end.js
@@ -45,7 +45,7 @@ if ( !window.location ) {
 }
 
 // This can happen
-if ( !vAPI ) {
+if ( typeof vAPI !== 'object' ) {
     //console.debug('contentscript-end.js > vAPI not found');
     return;
 }
diff --git a/src/js/contentscript-start.js b/src/js/contentscript-start.js
index ba756c8..cf46bea 100644
--- a/src/js/contentscript-start.js
+++ b/src/js/contentscript-start.js
@@ -44,7 +44,7 @@ if ( !window.location ) {
 }
 
 // This can happen
-if ( !vAPI ) {
+if ( typeof vAPI !== 'object' ) {
     //console.debug('contentscript-start.js > vAPI not found');
     return;
 }