Cycle race track lap counter

Having started a new test and just pressing buttons very quickly gives me this:

Running onInit()...
WARNING: jsble_exec_pending: Unknown enum type 216
36 12 3
WARNING: jsble_exec_pending: Unknown enum type 56
7 89 80
WARNING: jsble_exec_pending: Unknown enum type 56
19 89 80
WARNING: jsble_exec_pending: Unknown enum type 56
11 62 53
WARNING: jsble_exec_pending: Unknown enum type 120
0 22 13
New interpreter error: FIFO_FULL
WARNING: jsble_exec_pending: Unknown enum type 152
10 61 52
WARNING: jsble_exec_pending: Unknown enum type 56
2 177 168

But everything seems to keep working after that. Nothing got stuck.
What is this about?