Fatal System Error

A problem has been detected and the system has been stopped to prevent damage to your website.
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Technical information:
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Fatal error: Uncaught Error: Call to a member function fetch_array() on boolean in /home/interoutsh/domains/interoutshopzeewolde.nl/public_html/lib/MP2myAdmin/classes/databaseClass.php:282 Stack trace: #0 /home/interoutsh/domains/interoutshopzeewolde.nl/public_html/lib/MP2myAdmin/mods/accounts/create_handler.php(629): Database->query('result', NULL) #1 /home/interoutsh/domains/interoutshopzeewolde.nl/public_html/lib/MP2myAdmin/mods/accounts/accountsMod.php(337): include('/home/interouts...') #2 /home/interoutsh/domains/interoutshopzeewolde.nl/public_html/lib/MP2myAdmin/mods/content/contentMod.php(52): Accounts->build(Array) #3 /home/interoutsh/domains/interoutshopzeewolde.nl/public_html/lib/MP2myAdmin/classes/templateClass.php(183): Content->tplshow(Array, '<!DOCTYPE html>...') #4 /home/interoutsh/domains/interoutshopzeewolde.nl/public_html/lib/MP2myAdmin/classes/templateClass.php(29): Template->parseTemplate() #5 /home/interoutsh/domains/interoutshopzeewolde.nl/public_html/lib/MP2myAdmin/classes/loadClass.php(26): Templa in /home/interoutsh/domains/interoutshopzeewolde.nl/public_html/lib/MP2myAdmin/classes/databaseClass.php on line 282
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