Get the following stack trace:

        Call history:

        db.scm:90: mutex-lock!
        db.scm:93: current-milliseconds
        db.scm:95: mutex-unlock!
        db.scm:106: k606
        db.scm:106: g610
        db.scm:3324: g4079
        db.scm:3342: db:compare-itempaths
        db.scm:3266: debug:print-info
        common_records.scm:96: debug:debug-mode
        db.scm:3268: string-split
        db.scm:3272: regex#string-substitute
        db.scm:3273: regex#string-substitute
        api.scm:106: k5
        api.scm:106: g9
        api.scm:109: get-call-chain
        api.scm:110: print-call-chain           <--
 message: incomplete char set
ERROR: local query failed. Trying again.