AJAX error with Table Press

Another one conflict… when I try to save a table in TablePress plugin, I have the error “AJAX call failed: error – . Try again while holding down the “Shift” key.”. It happens only of OneSignal plugin is enabled. I tested it in a clear site and I can’t create a table at all if OneSignal enabled.

To reproduce:
1. Install TablePresss
2. Try to create a table
3. Install OneSignal and enable it
4. Try to edit and save table
5. Try to create a new table