[maxHeight] property not working.

[mewehren]

What iam doing wrong? Ionic 4 Version

HTML
<lib-ionic-pullup (onExpand)="footerExpanded()" (onCollapse)="footerCollapsed()" [(state)]="footerState"
[toolbarTopMargin]="100" [minBottomVisible]="200" [maxHeight]="getMaximumHeight()">

TS
getMaximumHeight() {
return window.innerHeight / 2;
}

my content still fills the entire screen