Merge pull request #138 from Yogu/fix-out-of-range-columns

Defensive coding to prevent out-of-range column
evanw · Aug 17, 2017 · 9addc16 · 9addc16
2 parents 6020c02 + 58a1169
commit 9addc16
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/source-map-support.js b/source-map-support.js
@@ -331,8 +331,9 @@ function wrapCallSite(frame) {
 
     // Fix position in Node where some (internal) code is prepended.
     // See https://github.com/evanw/node-source-map-support/issues/36
-    if (line === 1 && !isInBrowser() && !frame.isEval()) {
-      column -= 62;
+    var headerLength = 62;
+    if (line === 1 && column > headerLength && !isInBrowser() && !frame.isEval()) {
+      column -= headerLength;
     }
 
     var position = mapSourcePosition({