Magento Export Blank Screen? Unsupported Operand Types Error? Try this fix.

On a couple different Magento sites, one of them running CE version 1.7.0.2 and the other running CE version 1.8.0.0, I was having trouble exporting even limited selections of the catalog from the System > Import/Export function of the admin. In some cases clearing the cache would resolve the issue, but not always. I increased the PHP memory_limit setting, and that also did not resolve the issue. Finally I checked my PHP error logs and saw an “Unsupported operand types” error message related to the core product export file. Here’s what fixed it on a (so far) permanent basis:

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