Combine Selected Area Features - Polygon join failed

in Bug Report
Frequently get the following error when attempting to combining two polygons. Sometimes it works, sometimes it doesn't. If I have time, I'll delete some vertices until the problem goes away, but I've hit a wall and can't figure out how to make this work for the task that's currently on my plate.
Please advise on a work-around if any exists.

Best Answer
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946 Global Mapper User Posts: 163
Use INVALID tool to see where the actual problem is and fix.
Select areas/ right click /analysis /INVALID
Answers
This did the trick. Thank you. After the area is "fixed", polygon join works as expected.