ob_end_flush error when using wpdb in plugin

You did not provide that information, so I have to guess a little bit: You are using PHP 5.4 and zlib.output_compression is on on your server?

Then you just stumbled upon bug #18525. Possible solutions:

  • Disable zlib.output_compression.
  • Apply the patch provided there and report back on that ticket if it works.
  • Disable notices.

What you can do when you decide to release the plugin to the public is another issue …

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