Okular breaks after KDE update solution rebuild qt5-styleplugins

This is the second time Okular doesn't function after a KDE update. Solution: qt5-styleplugins has to be rebuild.
$packer -S qt5-styleplugins
Simple enough if you know what to do.
Error message was:
qt5ct: using qt5ct plugin
Cannot mix incompatible Qt library (version 0x50900) with this library (version 0x50901)
Aborted (core dumped)