🐛 Add another guard when accessing tokenLinesForScreenRows

I hope it’ll provide some insight on what’s happening with #481
atom-minimap · May 25, 2016 · 80fd653 · 80fd653
1 parent 840e566
commit 80fd653
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/lib/mixins/canvas-drawer.js b/lib/mixins/canvas-drawer.js
@@ -482,7 +482,11 @@ export default class CanvasDrawer extends Mixin {
     const context = this.tokensLayer.context
     const {width: canvasWidth} = this.tokensLayer.getSize()
 
-    if (!this.tokenLinesForScreenRows) { return }
+    if (typeof this.tokenLinesForScreenRows != 'function') {
+      console.error(`tokenLinesForScreenRows should be a function but it was ${typeof this.tokenLinesForScreenRows}`, this.tokenLinesForScreenRows)
+
+      return
+    }
 
     const screenRowsTokens = this.tokenLinesForScreenRows(firstRow, lastRow)