gistfile1.diff

diff --git a/toolkit/devtools/debugger/server/dbg-script-actors.js b/toolkit/devtools/debugger/server/dbg-script-actors.js
--- a/toolkit/devtools/debugger/server/dbg-script-actors.js
+++ b/toolkit/devtools/debugger/server/dbg-script-actors.js
@@ -502,6 +502,7 @@ ThreadActor.prototype = {
     let breakpoints = this._breakpointStore[aLocation.url];
 
     let actor;
+try {
     if (breakpoints[aLocation.line].actor) {
       actor = breakpoints[aLocation.line].actor;
     } else {
@@ -511,7 +512,10 @@ ThreadActor.prototype = {
       });
       this._hooks.addToParentPool(actor);
     }
-
+}catch(e){
+  dumpn(">>>>>>>>>>>>>>>> "+e);
+  dump(new Error().stack);
+}
     let scripts = this.dbg.findScripts(aLocation);
     if (scripts.length == 0) {
       return {
@@ -1148,6 +1152,7 @@ ThreadActor.prototype = {
         let bp = existing[line];
         // Limit search to the line numbers contained in the new script.
         if (bp && line >= aScript.startLine && line <= endLine) {
+for (let i in bp) dump(">>>>>>>>>>>>>> bp: "+i); dump("\n");
           this._setBreakpoint(bp);
         }
       }
pas