Ok yes that is an issue. 
First question, can the calculation of the counter go into the HUD blueprint instead? if it only affects the hud display then I would move all of it there.
If it can not you will want to create a public variable in the PlayerController blueprint for the counter, using this blueprint is easiest since you can always access the PlayerController using a Get Player Controller node. Don’t move any of the calculation there, just the variable. Make sure you set the variable to Visible to allow it to be seen from another bp.
With this you should be able to get the variable from both blueprints easily, just drag a wire off of Get Player Controller and type the name of your variable, it should come up. Hook it all back up and it should work properly now.
You can also use the Game State or Game Instance blueprints to store the variable, but any of these should work.