diff --git a/src/babel/generation/index.js b/src/babel/generation/index.js
index 925d640247..46d40013ab 100644
--- a/src/babel/generation/index.js
+++ b/src/babel/generation/index.js
@@ -344,7 +344,7 @@ class CodeGenerator {
 
       //
       if (comment.type === "CommentBlock" && this.format.indent.adjustMultilineComment) {
-        var offset = comment.loc.start.column;
+        var offset = comment.loc && comment.loc.start.column;
         if (offset) {
           var newlineRegex = new RegExp("\\n\\s{1," + offset + "}", "g");
           val = val.replace(newlineRegex, "\n");