error: The given key was not present in the dictionary when browsing a page with the Sponsorship Search part displaying results

When client tried to load sponsorship website using firefox web browser they received the error: 

The given key was not present in the dictionary.
[KeyNotFoundException: The given key was not present in the dictionary.]
   System.ThrowHelper.ThrowKeyNotFoundException() +36
   System.Collections.Generic.Dictionary`2.get_Item(TKey key) +120
   Blackbaud.AppFx.Sponsorship.ContentManagement.OpportunitySearchMergeFieldData.GetDataForField(Int32 fieldId) +1676
   Blackbaud.Web.Content.Core.Controls.MergeField.get_Text() +815
   System.Web.UI.WebControls.Label.RenderContents(HtmlTextWriter writer) +67
   System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +52
   Blackbaud.Web.Content.Core.Controls.MergeField.Render(HtmlTextWriter writer) +89
Download and install the latest Service Pack which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.  

Steps to Duplicate


1. Go to BBIS page which contains sponsorship parts
2. Notice Error: 
The given key was not present in the dictionary.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Environment

 Chrome;Firefox;Internet Explorer
 Blackbaud Internet Solutions
 4.0
 4.0
 4.0.170.0 (Service Pack 11)
 Blackbaud Internet Solutions version number: 6.64.158.0

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