Ignore undefined content in generating source maps (#3360)

less · Feb 21, 2019 · 5cc99b5 · 5cc99b5
1 parent 6155c4d
commit 5cc99b5
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/lib/less/source-map-output.js b/lib/less/source-map-output.js
@@ -69,6 +69,12 @@ module.exports = function (environment) {
                 // adjust the source
                 inputSource = inputSource.slice(this._contentsIgnoredCharsMap[fileInfo.filename]);
             }
+
+            // ignore empty content
+            if (inputSource === undefined) {
+                return;
+            }
+
             inputSource = inputSource.substring(0, index);
             sourceLines = inputSource.split('\n');
             sourceColumns = sourceLines[sourceLines.length - 1];