Cancelling "add point" gives this error

[bwhallett]

"System Error Please report this error to the developers. com.google.gwt.core.client.JavaScriptException?: (TypeError?): ca is null fileName:  http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html lineNumber: 39350 stack: $addChemicalAnalysis_0([object Object],null,421,214.39999389648438)@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:39350 onSuccess_27(null)@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:39698 $cancel_3([object Object])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:41391 onClick_34([object Object])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:41420 $fireClick([object Object],[object Object])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:7010 $onBrowserEvent([object Object],[object MouseEvent?])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:6272 onBrowserEvent_2([object MouseEvent?])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:6304 dispatchEventImpl([object MouseEvent?],[object HTMLButtonElement],[object Object])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:4279 dispatchEventAndCatch([object MouseEvent?],[object HTMLButtonElement],[object Object])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:4256 dispatchEvent([object MouseEvent?],[object HTMLButtonElement],[object Object])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:4246 ([object MouseEvent?])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:4699 (TypeError?): ca is null fileName:  http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html lineNumber: 39350 stack: $addChemicalAnalysis_0([object Object],null,421,214.39999389648438)@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:39350 onSuccess_27(null)@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:39698 $cancel_3([object Object])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:41391 onClick_34([object Object])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:41420 $fireClick([object Object],[object Object])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:7010 $onBrowserEvent([object Object],[object MouseEvent?])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:6272 onBrowserEvent_2([object MouseEvent?])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:6304 dispatchEventImpl([object MouseEvent?],[object HTMLButtonElement],[object Object])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:4279 dispatchEventAndCatch([object MouseEvent?],[object HTMLButtonElement],[object Object])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:4256 dispatchEvent([object MouseEvent?],[object HTMLButtonElement],[object Object])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:4246 ([object MouseEvent?])@ http://samana.cs.rpi.edu:8080/metpetwebtst/1FA072048316584F05357CE47BFC8BF0.cache.html:4699"