Original reported as JIRA issue at
http://javafx-jira.kenai.com/browse/RT-15811

FX runtime : http://jfx.sfbay.sun.com/hudson/job/presidio-deploy-scrum/252/label=windows-i586-14/artifact/artifacts/bundles/release/ 
JRE: jdk7-b147 and latest 7-client build 

Under negative scenarios testing it has been noticed that passing null to JSObject methods e.g. JSObject.eval either hangs or crashes the VM/browser 
Crash logs: 
http://sqeweb.us.oracle.com/deployment2/jitu/latest_ws_test/6/deployment/src/javafx/hs_err_pid4168.log 
http://sqeweb.us.oracle.com/deployment2/jitu/latest_ws_test/6/deployment/src/javafx/hs_err_pid5428.log 

Steps to reproduce 
1) Install jre followed by fx runtime 
2) load following applet inside the browser 
http://sqeweb.us.oracle.com/deployment2/jitu/latest_ws_test/6/deployment/src/javafx/LiveConnect/LiveConnect/html/EvalTest_1Plus1_negative.html 

It has been noticed most of the time IE hangs(sometimes crashes too) but firefox/chrome crashes right away