trigger to remove managed package licenses when user becomes inactive

Please try below code. 

public void doRemoveLicense(List<id> inactiveUser) {
	if(inactiveUser != null && inactiveUser.size() > 0 ){
		Set<Id> packLicnSet = new Set<Id>();           
		//SOQL to get the package license/installed package Id
		List<PackageLicense> pckgLicenseList = [SELECT Id, NamespacePrefix FROM PackageLicense WHERE NamespacePrefix = 'TestPackage' OR NamespacePrefix = 'test'];
		system.debug('pckgLicenseList===' +pckgLicenseList);
		if(pckgLicenseList != null && pckgLicenseList.size() > 0){
            List<UserPackageLicense> uplList = new List<UserPackageLicense>([select id,PackageLicenseid,Userid from UserPackageLicense where PackageLicenseid IN :pckgLicenseList AND userId IN :inactiveUser]);
			List<UserPackageLicense> upl_removeList = new List<UserPackageLicense>();
            for(UserPackageLicense ux : uplList) {
                //Removing the license to the current user
                upl_removeList.add(ux);
            }
            if(!upl_removeList.isEmpty()) {
                try{
                    delete upl_removeList; //DML operation
                }catch(Exception e){
					system.debug(' delete exception: '+ e.getStackTrace() + ' \n exception message :'+e.getMessage());
				}
            }
        }// end of Inactive user list
	}	
}