diff --git a/remix-debug/src/Ethdebugger.js b/remix-debug/src/Ethdebugger.js
index 0b63056a75..d5fcd8afbb 100644
--- a/remix-debug/src/Ethdebugger.js
+++ b/remix-debug/src/Ethdebugger.js
@@ -83,7 +83,7 @@ Ethdebugger.prototype.sourceLocationFromVMTraceIndex = function (address, stepIn
 }
 
 Ethdebugger.prototype.sourceLocationFromInstructionIndex = function (address, instIndex, callback) {
-  this.debugger.callTree.sourceLocationTracker.getSourceLocationFromInstructionIndex(address, instIndex, this.solidityProxy.contracts, function (error, rawLocation) {
+  this.callTree.sourceLocationTracker.getSourceLocationFromInstructionIndex(address, instIndex, this.solidityProxy.contracts, function (error, rawLocation) {
     callback(error, rawLocation)
   })
 }