diff --git a/src/plugin/css.js b/src/plugin/css.js
index 0ebbd16..5669039 100644
--- a/src/plugin/css.js
+++ b/src/plugin/css.js
@@ -66,7 +66,7 @@
                 return !!(sheet.cssRules || sheet.rules).length;
             } catch (e) {
                 // In case of access error assume that css is loaded
-                return true;
+                return false;
             }
         }
 
@@ -97,4 +97,4 @@
 /*if ($P.WORKER || $P.NODE) {*///#JSCOVERAGE_ENDIF/*}*/
     };
 
-}(sandbox));
\ No newline at end of file
+}(sandbox));