the key that crashes coinomi is generated from all nulls, that is, 32 bytes of binary zeroes. here's the message I get from bitcoind when attempting to import it:
$ bitcoin-cli importprivkey 5HpHagT65TZzG1PH3CSu63k8DbpvD8s5ip4nEB3kEsreAbuatmU "nulls" false
error: {"code":-5,"message":"Private key outside allowed range"}
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