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Error OnSave Get Object CRM 2011

Hi all,
I’m new to the forum and CRM so hoping you experts can help solve a minor irritation J
Recently we’ve started to get an error message when we click on ‘Save’ or ‘Save & Close’ in Opportunity records.
“There was an error with this field's customised event.
Error:Unable to get property 'getObject' of undefined or null reference”
We're not 100% what triggered this as we have done a few changes to the Opportunity form, moved, added and removed superfluous fields, so could be anyone of these.
The script in question is:
//call the saveMultiSelect function of the Multiselect html web resource on save of the form.
function multiSelectOnSave(executionObject) {
I’ve searched high and low to try and solve this question, looked in books and scoured the internet but without success, what I need to know is:

a)      Is it safe to just delete this event?

b)      If not can anyone help or point me in the right direction to correct it?

Any help would be greatly appreciated.
Many thanks