diff --git a/packages/babel-jest/src/index.js b/packages/babel-jest/src/index.js
index 56af59058ef8..b2306177b9ae 100644
--- a/packages/babel-jest/src/index.js
+++ b/packages/babel-jest/src/index.js
@@ -123,7 +123,9 @@ const createTransformer = (options: any) => {
         ]);
       }
 
-      return babelTransform(src, theseOptions).code;
+      // babel v7 might return null in the case when the file has been ignored.
+      const transformResult = babelTransform(src, theseOptions);
+      return transformResult ? transformResult.code : src;
     },
   };
 };