SHAInet .to_json Invalid mem access

shainet.cr

Invalid memory access (signal 11) at address 0x7ffcd8a16ff8
[0x5567f6f7dbf6] *CallStack::print_backtrace:Int32 +118
[0x5567f6f6bb4b] __crystal_sigfault_handler +75
[0x7fd877f34a80] ???
[0x5567f701371e] *Float::Printer::DiyFP::from_f<Float64>:Float::Printer::DiyFP +14
[0x5567f7013663] *Float::Printer::DiyFP::from_f_normalized<Float64>:Float::Printer::DiyFP +19
[0x5567f70125f1] *Float::Printer::Grisu3 +113
[0x5567f700e89a] *Float::Printer +6890
[0x5567f700cd59] *Float::Printer +201
[0x5567f7000fd6] *Float64#to_s<IO+>:(IO+ | Nil) +6
[0x5567f6ff252e] *IO+ +14
[0x5567f7036801] *JSON::Builder#number<Float64>:IO+ +161
[0x5567f7000fc6] *Float64 +6
[0x5567f70294e4] *SHAInet::Neuron +132
[0x5567f702f9b1] *SHAInet::Synapse +129
[0x5567f70260dc] *Array(SHAInet::Synapse) +92
[0x5567f7029b6b] *SHAInet::Neuron +1803
[0x5567f702f9b1] *SHAInet::Synapse +129
[0x5567f70260dc] *Array(SHAInet::Synapse) +92
[0x5567f7029b6b] *SHAInet::Neuron +1803
[0x5567f702f9b1] *SHAInet::Synapse +129
[0x5567f70260dc] *Array(SHAInet::Synapse) +92
[0x5567f7029b6b] *SHAInet::Neuron +1803
[0x5567f702f9b1] *SHAInet::Synapse +129
[0x5567f70260dc] *Array(SHAInet::Synapse) +92
[0x5567f7029b6b] *SHAInet::Neuron +1803
[0x5567f702f9b1] *SHAInet::Synapse +129
[0x5567f70260dc] *Array(SHAInet::Synapse) +92
[0x5567f7029b6b] *SHAInet::Neuron +1803
[0x5567f702f9b1] *SHAInet::Synapse +129
[0x5567f70260dc] *Array(SHAInet::Synapse) +92
[0x5567f7029b6b] *SHAInet::Neuron +1803
[0x5567f702f9b1] *SHAInet::Synapse +129
[0x5567f70260dc] *Array(SHAInet::Synapse) +92
[0x5567f7029b6b] *SHAInet::Neuron +1803
[0x5567f702f9b1] *SHAInet::Synapse +129
[0x5567f70260dc] *Array(SHAInet::Synapse) +92
[0x5567f7029b6b] *SHAInet::Neuron +1803
[0x5567f702f9b1] *SHAInet::Synapse +129
[0x5567f70260dc] *Array(SHAInet::Synapse) +92
[0x5567f7029b6b] *SHAInet::Neuron +1803
[0x5567f702f9b1] *SHAInet::Synapse +129