Fix crash in callback suggestions #308

Job	Run time
static analysis (Elixir 1.15.x \| Erlang/OTP 26.x)	57s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	2m 38s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	2m 42s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	2m 26s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	2m 43s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	3m 0s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	2m 55s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	2m 7s
mix test windows (Elixir 1.14.x \| Erlang/OTP 26.x)	2m 33s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	2m 30s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	2m 38s
mix test windows (Elixir 1.15.x \| Erlang/OTP 26.x)	2m 13s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	1m 8s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	1m 15s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	1m 10s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	1m 37s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	1m 19s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	1m 12s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	1m 38s
mix test (Elixir 1.14.x \| Erlang/OTP 26.x)	1m 20s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	1m 8s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	1m 9s
mix test (Elixir 1.15.x \| Erlang/OTP 26.x)	1m 5s
	43m 23s

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