Title: Warning: array_key_exists() expects parameter 2 to be array
Last modified: May 28, 2019

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# Warning: array_key_exists() expects parameter 2 to be array

 *  [axwellion](https://wordpress.org/support/users/axwellion/)
 * (@axwellion)
 * [7 years ago](https://wordpress.org/support/topic/warning-array_key_exists-expects-parameter-2-to-be-array-5/)
 * I am experiencing this issue with the plug in: On my glossary page I get the 
   following warning message at the top of my page
    **Warning: array_key_exists()
   expects parameter 2 to be array, null given** I found and implemented your previous
   fixed code for this warning in Github that you referenced here: [https://wordpress.org/support/topic/warning-array_key_exists-16/](https://wordpress.org/support/topic/warning-array_key_exists-16/)
   but the problem seems to be back again. In fact, it has been back for a while
   and I don’t know how long nor why – except that I have updated my wordpress version
   to Guttenburg and I wonder if that could be why. Do you have any suggestions 
   on how this can be fixed on a more permanent basis? Has your Github version been
   rolled back into the official wordpress plugin site? Thank you
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fwarning-array_key_exists-expects-parameter-2-to-be-array-5%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

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 * Last reply from: [axwellion](https://wordpress.org/support/users/axwellion/)
 * Last activity: [7 years ago](https://wordpress.org/support/topic/warning-array_key_exists-expects-parameter-2-to-be-array-5/)
 * Status: not resolved