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Created attachment 122886 [details] screenshot with error When hovering over the content of a cell from the column-tag a tooltip with the text 'null' is displayed. This happens not every time. See attached screenshot. ---- Product Version: NetBeans IDE 7.2 (Build 201207171143) Java: 1.6.0_33; Java HotSpot(TM) Client VM 20.8-b03 System: Windows XP version 5.1 running on x86; Cp1252; de_DE (nb)