[Bug]: crash when jumping by time with two videos playing

[im4aratu]

GridPlayer version

0.3.0

What OS are you using?

Windows

OS Version / Linux distribution

Win 10 21H2

What distribution channel are you using? [LINUX ONLY]

No response

Bug description

When viewing 2 videos side by side clicking on ALL-> Jump to -> +30s sometimes exits the program and gives the error shown in the log excerpt below. (same thing happens for +15s)

Log excerpt

Traceback (most recent call last):
  File "gridplayer\player\manager.py", line 29, in <lambda>
  File "gridplayer\player\managers\active_block.py", line 60, in cmd_active
  File "gridplayer\widgets\video_block.py", line 123, in wrapper
  File "gridplayer\widgets\video_block.py", line 133, in wrapper
  File "gridplayer\widgets\video_block.py", line 448, in manual_seek
AttributeError: 'VideoBlock' object has no attribute 'seek_shift'