After dieing Minecraft start Saving World over and over

I want to open a command block after i died

I cannot open it and the console keeps saying :

[16:53:41] [Server thread/INFO]: Saving and pausing game...
[16:53:41] [Server thread/INFO]: Saving chunks for level 'Command Blocks'/Overworld
[16:53:41] [Server thread/INFO]: Saving chunks for level 'Command Blocks'/Nether
[16:53:41] [Server thread/INFO]: Saving chunks for level 'Command Blocks'/The End

Place down a commandblock.
Kill yourself.
Try to open the commandblock