WARNING(2): "array_merge(): Argument #2 is not an array"

WARNING(2): "array_merge(): Argument #2 is not an array"

WARNING(2): "array_merge(): Argument #2 is not an array"

WARNING(2): "array_merge(): Argument #2 is not an array"

FATAL ERROR(1): "Call to a member function isActive() on null"Information:
<br />
<b>Fatal error</b>:  Call to a member function isActive() on null in <b>/www/htdocs/w0127144/testshop.bueroland-dresden.de/htdocs/templates_c/345881c41ae2440a755ea3f43ef426587e59d985.file.topbar.html.php</b> on line <b>27</b><br />