I can reproduce also with typing: "df<baskspace>"

Examining the crash a bit more, the crash place is:

#2  get_place_type_from_attributes (Python Exception <class 'gdb.error'> There is no member named keys.: 
ht=0x5555573ffd20) at ../geocode-glib/geocode-nominatim.c:395
395	                        rank = atoi (g_hash_table_lookup (ht, "place_rank"));

and it crashes for me with:

(gdb) p (char *)place_tree->children->data
$5 = 0x55555747a7f0 "Mexico"

where the received "contents" is:

(gdb) printf "%s\n", contents

[{"place_id":258281399,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. https://osm.org/copyright","osm_type":"relation","osm_id":1376330,"boundingbox":["19.0482367","19.5927572","-99.3649242","-98.9403028"],"lat":"19.4326296","lon":"-99.1331785","display_name":"Mexico City, Mexico","place_rank":8,"category":"boundary","type":"administrative","importance":0.8399239324417648,"icon":"https://nominatim.openstreetmap.org/ui/mapicons//poi_boundary_administrative.p.20.png","address":{"city":"Mexico City","country":"Mexico","country_code":"mx"}},{"place_id":258507718,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. https://osm.org/copyright","osm_type":"relation","osm_id":421151,"boundingbox":["-16.0505592","-15.5001785","-48.2857911","-47.308387"],"lat":"-15.7754462","lon":"-47.7970891","display_name":"Federal District, Central-West Region, Brazil","place_rank":8,"category":"boundary","type":"administrative","importance":0.5669736634370575,"icon":"https://nominatim.openstreetmap.org/ui/mapicons//poi_boundary_administrative.p.20.png","address":{"state":"Federal District","region":"Central-West Region","country":"Brazil","country_code":"br"}},{"place_id":258421945,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. https://osm.org/copyright","osm_type":"relation","osm_id":106753,"boundingbox":["49.2392851","49.2694883","6.330546","6.3809877"],"lat":"49.2602817","lon":"6.3463759","display_name":"Aboncourt, Thionville, Moselle, Grand Est, Metropolitan France, 57920, France","place_rank":16,"category":"boundary","type":"administrative","importance":0.5550625335644064,"icon":"https://nominatim.openstreetmap.org/ui/mapicons//poi_boundary_administrative.p.20.png","address":{"village":"Aboncourt","municipality":"Thionville","county":"Moselle","state":"Grand Est","country":"France","postcode":"57920","country_code":"fr"}},{"place_id":258185940,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. https://osm.org/copyright","osm_type":"relation","osm_id":179122,"boundingbox":["46.438423","46.4955421","12.6064081","12.772056"],"lat":"46.4653657","lon":"12.7087174","display_name":"Sauris, UTI della Carnia, Friuli Venezia Giulia, Italy","place_rank":16,"category":"boundary","type":"administrative","importance":0.49910131222490195,"icon":"https://nominatim.openstreetmap.org/ui/mapicons//poi_boundary_administrative.p.20.png","address":{"village":"Sauris","municipality":"UTI della Carnia","state":"Friuli Venezia Giulia","country":"Italy","country_code":"it"}},{"place_id":257900909,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. https://osm.org/copyright","osm_type":"relation","osm_id":443306,"boundingbox":["48.3041599","48.3967227","10.7116593","10.8060927"],"lat":"48.3542454","lon":"10.7839603","display_name":"Diedorf, Augsburg (district), Bavaria, 86420, Germany","place_rank":16,"category":"boundary","type":"administrative","importance":0.4192479107424996,"icon":"https://nominatim.openstreetmap.org/ui/mapicons//poi_boundary_administrative.p.20.png","address":{"town":"Diedorf","county":"Augsburg (district)","state":"Bavaria","postcode":"86420","country":"Germany","country_code":"de"}},{"place_id":258643162,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. https://osm.org/copyright","osm_type":"relation","osm_id":1682106,"boundingbox":["47.5575384","47.5876189","8.6307296","8.6675839"],"lat":"47.5720029","lon":"8.647344","display_name":"Dorf, Bezirk Andelfingen, Zurich, 8458, Switzerland","place_rank":16,"category":"boundary","type":"administrative","importance":0.3485923461319498,"icon":"https://nominatim.openstreetmap.org/ui/mapicons//poi_boundary_administrative.p.20.png","address":{"village":"Dorf","county":"Bezirk Andelfingen","state":"Zurich","postcode":"8458","country":"Switzerland","country_code":"ch"}},{"place_id":259663060,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. https://osm.org/copyright","boundingbox":["-15.924044877985","-15.604044877985","-47.99296336309","-47.67296336309"],"lat":"-15.764044877985176","lon":"-47.83296336309007","display_name":"Lago Norte, Região Geográfica Imediata do Distrito Federal, Região Integrada de Desenvolvimento do Distrito Federal e Entorno, Região Geográfica Intermediária do Distrito Federal, Federal District, Central-West Region, DF, Brazil","place_rank":21,"category":"place","type":"postcode","importance":0.32499999999999996,"address":{"town":"Lago Norte","municipality":"Região Geográfica Imediata do Distrito Federal","county":"Região Integrada de Desenvolvimento do Distrito Federal e Entorno","state_district":"Região Geográfica Intermediária do Distrito Federal","state":"Federal District","region":"Central-West Region","postcode":"DF","country":"Brazil","country_code":"br"}},{"place_id":52586721,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. https://osm.org/copyright","osm_type":"node","osm_id":4444214137,"boundingbox":["47.5555753","47.5955753","10.5345051","10.5745051"],"lat":"47.5755753","lon":"10.5545051","display_name":"Dorf, Ösch, Pfronten, Landkreis Ostallgäu, Bavaria, 87459, Germany","place_rank":19,"category":"place","type":"suburb","importance":0.275,"icon":"https://nominatim.openstreetmap.org/ui/mapicons//poi_place_village.p.20.png","address":{"suburb":"Dorf","village":"Ösch","town":"Pfronten","county":"Landkreis Ostallgäu","state":"Bavaria","postcode":"87459","country":"Germany","country_code":"de"}},{"place_id":761033,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. https://osm.org/copyright","osm_type":"node","osm_id":271440758,"boundingbox":["49.0576253","49.0976253","11.8491223","11.8891223"],"lat":"49.0776253","lon":"11.8691223","display_name":"Endorf, Laaber, Laaber (VGem), Landkreis Regensburg, Bavaria, 93164, Germany","place_rank":19,"category":"place","type":"village","importance":0.275,"icon":"https://nominatim.openstreetmap.org/ui/mapicons//poi_place_village.p.20.png","address":{"village":"Endorf","municipality":"Laaber (VGem)","county":"Landkreis Regensburg","state":"Bavaria","postcode":"93164","country":"Germany","country_code":"de"}},{"place_id":3336708,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. https://osm.org/copyright","osm_type":"node","osm_id":410413347,"boundingbox":["48.5139822","48.5539822","13.907142","13.947142"],"lat":"48.5339822","lon":"13.927142","display_name":"Dorf, Sarleinsbach, Bezirk Rohrbach, Upper Austria, 4152, Austria","place_rank":19,"category":"place","type":"village","importance":0.275,"icon":"https://nominatim.openstreetmap.org/ui/mapicons//poi_place_village.p.20.png","address":{"village":"Dorf","county":"Bezirk Rohrbach","state":"Upper Austria","postcode":"4152","country":"Austria","country_code":"at"}}]

This can be related to:
https://gitlab.gnome.org/GNOME/geocode-glib/-/issues/5
which seems to be part of the 3.26.1 release.

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