Default sound file for late tea does not exist

The default notification file for "Tea is getting lonely" is "Oxygen-Sys-App-Special.ogg", which does not exist.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: kteatime 4:17.12.3-0ubuntu1
Uname: Linux 4.16.0-041600rc6-generic x86_64
NonfreeKernelModules: rfcomm ccm cmac bnep snd_hda_codec_hdmi snd_hda_codec_idt intel_rapl x86_pkg_temp_thermal intel_powerclamp snd_hda_codec_generic coretemp kvm arc4 snd_hda_intel snd_hda_codec iwldvm mac80211 snd_hda_core snd_hwdep irqbypass intel_cstate btusb btrtl btbcm snd_pcm snd_seq_midi snd_seq_midi_event intel_rapl_perf input_leds iwlwifi hp_wmi snd_rawmidi mei_me joydev sparse_keymap serio_raw wmi_bmof btintel bluetooth snd_seq snd_seq_device cfg80211 rtsx_pci_ms snd_timer memstick ecdh_generic mei snd shpchp hp_accel lis3lv02d lpc_ich sch_fq_codel soundcore input_polldev tpm_infineon mac_hid hp_wireless ie31200_edac parport_pc ppdev lp parport ip_tables x_tables autofs4 algif_skcipher af_alg dm_crypt crct10dif_pclmul i915 crc32_pclmul ghash_clmulni_intel pcbc rtsx_pci_sdmmc aesni_intel i2c_algo_bit aes_x86_64 drm_kms_helper crypto_simd glue_helper cryptd psmouse syscopyarea sysfillrect e1000e sysimgblt fb_sys_fops ahci drm ptp libahci rtsx_pci pps_core wmi video
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
CurrentDesktop: KDE
Date: Sat Mar 24 18:09:05 2018
InstallationDate: Installed on 2018-03-23 (1 days ago)
InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180306.1)
SourcePackage: kteatime
UpgradeStatus: No upgrade log present (probably fresh install)